Watts Technical Catalogue

TechnicalCatalogue

The quality of a name :Long-lasting resistance

THERMOSTATIC ACTUATORSWITH LIQUID-FILLED SENSITIVE ELEMENTS

AND TEMPERATURE LOCKING SERIES 148 – 148SD - 148CD - 148GA

MAIN CHARACTERISTICS

- Available in the versions:• Standard• With Remote Sensor• With Remote Control

- Provision for using them with tamper-proof cover.

- Compact size and reduced weights

- Derived from actuator model 138 which, when associatedwith valves of Series 13OUM and 131UM, it is CEN certified inaccordance with EN215/1 and HD1215.2.

01A151-GB

The required temperature is set by turning the handwheeluntil the indicator coincides with the chosen value:The numbers and symbols given are associated with thetemperatures indicated in picture A.

The interval between the numbers corresponds to about 4°C.

Esempio:Pos. 0 Fully closedPos. Anti-freeze 8°CPos. 2 Reduced night-time setting 16°CPos. 3 Day-time setting 20°C

The anti-freeze position ensures minimum temperatureconditions (8 °C) thus protecting the intactness of thesystem, if regularly in operation, against intense cold.

Closed 12 °C 16 °C 20 °C 24 °C 28 °C

148Thermostaticactuator.

148SDThermostatic actuator withremote sensor.

148CDThermostatic actuator with remote control.

148GATamper-proof cover. 148GA 30

Part No. Weight(g)

148CD 450

Part No. Weight(g)

148SD 250

Part No. Weight(g)

148 150

Part No. Weight(g)Thermostatic actuators Series 148, 148SD, 148CD are

devices for automatic room temperature control, byacting directly on the radiator of radiator-type heatingsystems.The actuators, which are installed on the thermostatadaptable radiator valves, automate the valve plugmovement through the presence of an element, inside theknob, which is sensitive to variations in room temperature.

DESCRIPTION

For quick setting and finding the ideal adjustment for eachsingle room, the actuator is provided with temperaturelocks, degree-by-degree, which allow above all:

Temperature locking

These devices (whose use is compulsory through ItalianAct 10/91), when coupled with thermostat adaptablevalves, adapt the amount of heat emitted by the radiatorsto the required temperature and ensure high comfortlevels with consistent energy saving thanks to naturallyoccurring heat sources in the room.

APPLICATION

The device is operated by a liquid-filled sensitive elementincorporated in the knob, which, upon expanding or con-tracting, acts on the valve plug rod in relation to thedeviation between set-point and actual room temperature.When the room temperature exceeds the required level,the sensitive element determines the gradual closing ofthe valve plug and therefore it appropriately reduces thehot water flow feeding the radiator; when, instead, theroom temperature drops, the actuator causes the valveplug to open thus producing an increase in the circulationof hot water in the radiator, so that the temperature set ineach single room is held at a constant level.

OPERATION

REGOLAZIONE

Features1) Liquid-filled sensitive element

2) Compensation mechanism

3) Adjustment range locking/limiting system

4) Valve plug thrust rod

12

3

43

2

43

2

43

2

Pic. 2Pic. 1

32

1

32

1

32

1

Pic. 4Pic. 3

Pic. A

0 1 2 3 4 5

8 °CAntifreeze

4

Never allow the actuator to be affected by factors whichcould falsify measurement of room temperature (e.g.behind curtains, direct exposure to the sun's rays,radiator placed in a recess, etc...) and allow access to theadjustment handwheel (e.g. shielding of the radiator).When this is not possible, it is advisable to adopt versionswith remote sensor Pic.5 (Art. 148SD) or with remotecontrol Pic.6 (Art. 148CD).

These models differ in that the sensor, detached from thetransducer element through a liquid-filled capillary, maybe placed in the most suitable point and hence measurethe exact temperature existing in the room. Above all,model 148CD allows having both remote sensor andremote control; it is used when the valve position is suchas to make manual adjustment difficult. The use oftamper-proof cover Art. 148GA is highly recommended toprotect the actuator against accidental tampering and/orvandalism in public places (schools, hospitals, etc). Itsinstallation is shown below.

INSTALLATION

• Limiting the temperature adjustment range• Selecting a set value• Limiting the valve closing set-point

To fix a range of adjustment 16 to 20 °C proceed asfollows:

Fig. 1 - Turn the actuator knob so that the indicator corre-sponds to the required max. value. See Pic. 1: Pos. 3 = 20°C.

Fig. 2 - Lift out the first lock on the right and place it imme-diately alongside the indicator. Hence the upper limit of theadjustment range is fixed (Pos. 3).

Fig. 3 - Turn the actuator knob until the indicator points tothe required minimum value. See Pic. 3: Pos. 2 = 16°C.

Fig. 4 - Lift out the lock on the left and place it immedia-tely alongside the indicator. Hence the lower limit of theadjustment range is fixed (Pos. 2).

Therefore the setting can easily be readjusted in relationto the various daily requirements thanks to this"memory" system.

The installation, which does not requi-re any plumbing work, may also becarried out with the systems runningand involves the following steps:

1) Remove the cap or handwheel fromthe valve body.

2) Make the presetting if necessary byfollowing the design instructions orselecting the position from the appro-priate charts.

3) Approach the thermostatic actuatorin fully open position (Pos. 5) to thevalve body, with the reference indica-tor clearly visible.

4) Tighten the nickel-plated ring nut byhand until fully home.

It is recommended to avoid verticalpositions of the actuator during instal-lation.

1

23

4 5

54

43

2

Pic.4

12

12

Pic.3

1

23

4 5

1

23

4 5

Pic.2Pic.1

43

2

43

2

Pic.6

Pic.5

UNI EN 215-1/90

DESIGN FEATURES

Sensitive element capsule CuSn8

Springs Stainless steel

Thrust rod Nylon 30%

Handwheel ABS

TECHNICAL CHARACTERISTICS

Thermostatic actuator 148 (derived from CEN certified model 138 coupled to valves Series 130 D and F, Series 131 D and F)

Range of adjustment 8 to 28° C

Range of inalterability of thermostatic element -15 to 60° C

Hysteresis 0.4 K

Proportional band 2 K

Time constant 25 min

Effect of fluid temperature 1.5 K

Effect of differential pressure 0.5 K

Length of capillary (Art. 148SD - 148CD) 2 m

Flow rate/pressure drop charts

EN215/1Coupled with thermostatic actuator Series 138 and derived products Series 148.

130UM + 148 3/8" 0,73 233130UM + 148 1/2" 0,74 236130UM + 148 3/4" 0,79 251

Part No. Size Kvn qmN (l/h)

The charts show the hydraulic flow rate and pressure drop

characteristics for the valve body-actuator combination: in

the thermostatic function they assume their own particular

characteristics represented by straight lines -1K, -2K.

The nominal flow rate qmN is the one corresponding to -2K

when the presetting device is not operative.

The straight line marked max represents the flow rate when

the valve is fully opened.

The diagrams are valid when a presetting is not made on the

valve body.

Use of the tamper-proof cover

Thermostat adaptable valve bodies Series 13OUM, 131UM,

are fitted with a tamper-proof cover which protects the valve

rod and threading before the preliminary mounting on the

thermostatic head. It can be used for setting different flow

rates by rotating either clockwise (to close valve plug) or anti-

clockwise (to open valve plug), passing from full shut-off to

full opening according to the indications stamped on the

handwheel .

SIZE 3/8" 130UM - 1130UM

[ kPa ]

0.01 0.02 0.03 0.05 0.1 0.2 0.3 0.5 1 2 3

[ l/h ]

[ m /h ]3

[ m bar ]

200

100

[ mm c.a. ]

2000

800

500

400

300

200

1000

50

30

20

100

10

20

8

5

4

3

2

10

0.8

0.5

0.3

0.2

1

0.1

20 30 50 10010 200 300 500 1000 2000 3000

80

50

40

30

20

5

3

2

10

1

-1° K

-2° KMAX

FLOW

PR

ES

SU

RE

DR

OP

S

SIZE 1/2" 130UM - 1130UM

SIZE 3/4" 130UM

[ kPa ]

0.01 0.02 0.03 0.05 0.1 0.2 0.3 0.5 1 2 3

[ l/h ]

[ m /h ]3

[ m bar ]

200

100

[ mm c.a. ]

2000

800

500

400

300

200

1000

50

30

20

100

10

20

8

5

4

3

2

10

0.8

0.5

0.3

0.2

1

0.1

20 30 50 10010 200 300 500 1000 2000 3000

80

50

40

30

20

5

3

2

10

1

-1° K

-2° KMAX

FLOW

PR

ES

SU

RE

DR

OP

S

[ kPa ]

0.01 0.02 0.03 0.05 0.1 0.2 0.3 0.5 1 2 3

[ l/h ]

[ m /h ]3

[ m bar ]

200

100

[ mm c.a. ]

2000

800

500

400

300

200

1000

50

30

20

100

10

20

8

5

4

3

2

10

0.8

0.5

0.3

0.2

1

0.1

20 30 50 10010 200 300 500 1000 2000 3000

80

50

40

30

20

5

3

2

10

1

pos 1 Kv 0.25

pos 2 Kv 0.64

pos 3 Kv 0.92

pos 4 Kv 1.23

pos 5 Kv 1.50 pos 6 Kv 1.72

pos 7 Kv 1.93

A Kv 3.4

FLOW

PR

ES

SU

RE

DR

OP

S

Example

When it is preferred to use an analytical method to know the

pressure drop Dp (kPa), given the flow rate (litres/h) and the

Kvn, adopt the following relation:

Determine the pressure drop of the thermostat adaptable

valve Art. 131UM + 148 Nd 3/8" with a flow rate of 80 litres/h

� �



131UM + 148 3/8" 0,68 215131UM + 148 1/2" 0,74 235131UM + 148 3/4" 0,78 246


SIZE 3/8" 131UM - 1131UM

0.01* q

KvnDp = =� �2

0.01* 80

0,68Dp = = 1,38 kPa

2

[ kPa ]

0.01 0.02 0.03 0.05 0.1 0.2 0.3 0.5 1 2 3

[ l/h ]

[ m /h ]3

[ m bar ]

200

100

[ mm c.a. ]

2000

800

500

400

300

200

1000

50

30

20

100

10

20

8

5

4

3

2

10

0.8

0.5

0.3

0.2

1

0.1

20 30 50 10010 200 300 500 1000 2000 3000

80

50

40

30

20

5

3

2

10

1

-1° K-2° K

MAX

FLOW

PR

ES

SU

RE

DR

OP

S

SIZE 1/2" 131UM - 1131UM

SIZE 3/4" 131UM

[ kPa ]

0.01 0.02 0.03 0.05 0.1 0.2 0.3 0.5 1 2 3

[ l/h ]

[ m /h ]3

[ m bar ]

200

100

[ mm c.a. ]

2000

800

500

400

300

200

1000

50

30

20

100

10

20

8

5

4

3

2

10

0.8

0.5

0.3

0.2

1

0.1

20 30 50 10010 200 300 500 1000 2000 3000

80

50

40

30

20

5

3

2

10

1

pos 1 Kv 0.25

pos 2 Kv 0.60

pos 3 Kv 0.91

pos 4 Kv 1.18

pos 5 Kv 1.43 pos 6 Kv 1.64

pos 7 Kv 1.85

A Kv 2.60

FLOW

PR

ES

SU

RE

DR

OP

S

[ kPa ]

0.01 0.02 0.03 0.05 0.1 0.2 0.3 0.5 1 2 3

[ l/h ]

[ m /h ]3

[ m bar ]

200

100

[ mm c.a. ]

2000

800

500

400

300

200

1000

50

30

20

100

10

20

8

5

4

3

2

10

0.8

0.5

0.3

0.2

1

0.1

20 30 50 10010 200 300 500 1000 2000 3000

80

50

40

30

20

5

3

2

10

1

pos 1 Kv 0.25

pos 2 Kv 0.65

pos 3 Kv 0.88

pos 4 Kv 1.12 pos 5 Kv 1.30

pos 6 Kv 1.46

pos 7 Kv 1.57

A Kv 1.90

FLOW

PR

ES

SU

RE

DR

OP

S

WATTS Cazzaniga S.p.A.Via Parco, snc - 20046 Biassono (MI) - Italy

Phone ++39 039 49.86.1 - Fax ++ 39 039 49.86.285www.wattseurope.com e-mail: [email protected]

The descriptions and photographs contained in this product specification sheet are supplied by way of information only and are not binding. WATTS CAZZANIGA reserves the right to carry out any technical and design improvements to its products without prior notice. G

1- 1

48-C

D -

SD

- G

A -

GB

01/

’02

Overall Dimensions (mm)

85

49148

10

849

57

148CD

85

49

80

32

65

90

58

Ø40

34

148SD

148GA

THERMOSTATIC VALVE BODIESWITH PRESETTING

SERIES 130UM - 131UM - 1130UM - 1131UMSERIES 130UM - 131UM to CEN EN 215/1

MAIN FEATURES

Available in the following versions:- Angle body, straight body- For iron, copper and polyethylene

piping- With 3/8" radiator connection and

1/2" connection on pipe side- Plug stroke presetting device- Compact size- Conforms with UNI 8464/90

• The 130UM and 131UM series are CEN certified in accordance with EN215/1 and HD1215.2 (Type 130F)when coupled with actuators Series 138 and its derivedproducts (Series 148).

N.B. WATTS Cazzaniga manufacturers others CEN certified thermostatadaptable valves whose specifications are available on request.

01A201-GB

130UMAngle body valve,female threadfor iron pipes.

131UMStraight bodyvalve, femalethread for ironpipes.

1130UMAngle body valve,male thread forcopper orpolyethylenepipes.

1131UMStraight bodyvalve, male threadfor copper orpolyethylenepipes.

1130UMSN38X 3/8" 1/2" 2.6 1801130UMSN12 1/2" 1/2" 2.6 220

Part No. Size Size Kvs WeightRadiator Tube (g)

131UMSN38 3/8" 3/8" 1.1 210131UMSN12 1/2" 1/2" 1.9 270131UMSN34 3/4" 3/4" 2.6 360


130UMSN38 3/8" 3/8" 2.2 190130UMSN12 1/2" 1/2" 2.6 240130UMSN34 3/4" 3/4" 3.4 370


1131UMSN38X 3/8" 1/2" 1.9 2001131UMSN12 1/2" 1/2" 1.9 240


Thermostatic valve bodies Series 130UM, 131UM,1130UM, 1131UM are used as shut-off and controldevices for heat emitters (radiators, fan-coils, radiantpanels, etc.) in heating and air-conditioning systems,coupled with thermostatic actuators Series 138 and itsderived products Series 148.

The valves are supplied in the angle and straight bodyconfiguration, with male and female thread. They requireinstallation on the radiator.

Connection is through an O-ring sealed straight tailpieceusing an Allen wrench. Characteristic of the O-ring is thatit ensures perfect external sealing each time the valves areinstalled on radiators instead of others (manual) whichinvolve the risk of the internal threading on the radiatorplug no longer conforming.

DESCRIPTION

Thermostat adaptable valves are designed for roomtemperature control in manual or automatic mode whencoupled with thermostatic actuators (Series 148, 148SD,148CD) or electrothermic actuators (Art. 10C, 20C, 20CI).

The use of thermostat adaptable valves allows installationof metering systems (see Sections on Measuring andmetering systems) as required by Italian legislationAct 10/91 art. 26.

The valves are provided with active memory presettingwhich, when using thermostatic or thermoelectricactuators, enables exact balancing of the heating system.Such balancing is obtained by turning the ring nut locatedunder the handwheel in order to limit the plug stroke.

Above all when removing the handwheel for thermostat-ting the system, the active memory presetting holds thebalancing made permanently.

APPLICATION

Valve operation is by manual movement (through theprotective cap) or automatic movement (combined withthermostatic or electrothermic actuators) of the plugwhich shuts off the heat carrier fluid.

The hydraulic flow rate and pressure drop characteristicsfor the valves can be deduced from appropriate charts:in the thermostatic function they assume the characteri-stics of such device.

The reliability of the thermostatic valve bodiesSeries 130UM, 131UM, 1130UM, 1131UM, is guaranteedby the 100% testing of the production which tests forwater tightness of the valve body and its componentstowards the outside and the tight seal of the plug in itsflow shut-off function.

OPERATION

Features1) Presetting stuffing nut can be replaced also withthe system under pressure.

2) Complete plug can be replaced without emptyingthe system by using Art. 225.

3) O-ring sealed tailpiece.

4) Plug seal of elastomeric material, vulcanized ethyle-ne-propylene terpolymer (EDPM).

1

23

4

Valve selection is based on the size of the connection tothe radiator and the connecting piping.

Thermostatic valve bodies Series 130UM, 131UM,1130UM, 1131UM can be installed on radiators suppliedby iron, copper and plastic pipes, coupled with the balan-cing lockshield valves of Series 195UM, 196UM,1195UM, 1196UM.

When the system requires thermostatting, merely removethe protective cap from the cap and replace it with athermostatic or electrothermic actuators by tightening thering nut. All this can be done without plumbing work andwith the system running.

INSTALLATION

1 - Pull out the handwheel by turning it anti-clockwise andfully close the presetting ring nut (Pic. 1).

2 - Open the ring nut until the required position by makingthe number to coincide with the reference notch (Pic. 2)

PRESETTING

45

67

4

3

21

4

5

Kv values in the various presetting positions

Settingpositions

1234567A

130UM 3/8"

0.250.600.851.071.271.441.622.2

130UM 1/2"1130UM 3/8" & 1/2"

0.280.600.871.101.321.501.722.60

130UM 3/4"

0.250.640.921.231.501.721.933.40

131UM 3/8"

0.250.600.800.941.021.061.091.10

131UM 1/2"1131UM 3/8" & 1/2"

0.250.650.881.121.301.461.571.90

131UM 3/4"

0.300.600.911.181.431.641.852.60

Pic.2Pic.1

Hydraulic characteristics

Where :

Presetting

SIZE3/8"

1/2"

3/4"

3/8"

1/2"

3/4"

�%

a

Qms180

78

72

72

36

39

60

0,1

2180

176

171

165

122

162

30

0,2

3233

236

251

215

235

246

20

0,4

4233

236

251

215

235

246

10

0,4

5233

236

251

215

235

246

10

0,6

6233

236

251

215

235

246

10

0,7

7233

236

251

215

235

246

10

0,9

Max233

236

251

215

235

246

10

0,9

Qmn233

236

251

215

235

246

10

0,9

qms316

Kv =

DESIGN FEATURES

Valve body Brass CW617N

Handwheel Polypropylene

O-ring EPDM

Tailpiece Brass CW617N


Nominal pressure 10 bar

Max. differential pressure 1.5 bar

Max. temperature 110° C

Usable liquids Water also with glycol ≤ 30%



130UM + 148 3/8" 0,73 233130UM + 148 1/2" 0,74 236130UM + 148 3/4" 0,79 251


The charts show the hydraulic flow rate and pressure drop

characteristics for the valve body-actuator combination: in

the thermostatic function they assume their own particular

characteristics represented by straight lines -1K, -2K.

The nominal flow rate qmN is the one corresponding to -2K

when the presetting device is not operative.

The straight line marked max represents the flow rate when

the valve is fully opened.

The diagrams are valid when a presetting is not made on the

valve body.

Use of the tamper-proof cover

Thermostat adaptable valve bodies Series 13OUM, 131UM,

are fitted with a tamper-proof cover which protects the valve

rod and threading before the preliminary mounting on the

thermostatic head. It can be used for setting different flow

rates by rotating either clockwise (to close valve plug) or anti-

clockwise (to open valve plug), passing from full shut-off to

full opening according to the indications stamped on the

handwheel .

SIZE 3/8" 130UM - 1130UM

[ kPa ]

0.01 0.02 0.03 0.05 0.1 0.2 0.3 0.5 1 2 3

[ l/h ]

[ m /h ]3

[ m bar ]

200

100

[ mm c.a. ]

2000

800

500

400

300

200

1000

50

30

20

100

10

20

8

5

4

3

2

10

0.8

0.5

0.3

0.2

1

0.1

20 30 50 10010 200 300 500 1000 2000 3000

80

50

40

30

20

5

3

2

10

1

-1° K

-2° KMAX

FLOW

PR

ES

SU

RE

DR

OP

S

SIZE 1/2" 130UM - 1130UM

SIZE 3/4" 130UM

[ kPa ]

0.01 0.02 0.03 0.05 0.1 0.2 0.3 0.5 1 2 3

[ l/h ]

[ m /h ]3

[ m bar ]

200

100

[ mm c.a. ]

2000

800

500

400

300

200

1000

50

30

20

100

10

20

8

5

4

3

2

10

0.8

0.5

0.3

0.2

1

0.1

20 30 50 10010 200 300 500 1000 2000 3000

80

50

40

30

20

5

3

2

10

1

-1° K

-2° KMAX

FLOW

PR

ES

SU

RE

DR

OP

S

[ kPa ]

0.01 0.02 0.03 0.05 0.1 0.2 0.3 0.5 1 2 3

[ l/h ]

[ m /h ]3

[ m bar ]

200

100

[ mm c.a. ]

2000

800

500

400

300

200

1000

50

30

20

100

10

20

8

5

4

3

2

10

0.8

0.5

0.3

0.2

1

0.1

20 30 50 10010 200 300 500 1000 2000 3000

80

50

40

30

20

5

3

2

10

1

pos 1 Kv 0.25

pos 2 Kv 0.64

pos 3 Kv 0.92

pos 4 Kv 1.23

pos 5 Kv 1.50 pos 6 Kv 1.72

pos 7 Kv 1.93

A Kv 3.4

FLOW

PR

ES

SU

RE

DR

OP

S

Example

When it is preferred to use an analytical method to know the

pressure drop Dp (kPa), given the flow rate (litres/h) and the

Kvn, adopt the following relation:

Determine the pressure drop of the thermostat adaptable

valve Art. 131UM + 148 Nd 3/8" with a flow rate of 80 litres/h

� �



131UM + 148 3/8" 0,68 215131UM + 148 1/2" 0,74 235131UM + 148 3/4" 0,78 246


SIZE 3/8" 131UM - 1131UM

0.01* q

KvnDp = =� �2

0.01* 80

0,68Dp = = 1,38 kPa

2

[ kPa ]

0.01 0.02 0.03 0.05 0.1 0.2 0.3 0.5 1 2 3

[ l/h ]

[ m /h ]3

[ m bar ]

200

100

[ mm c.a. ]

2000

800

500

400

300

200

1000

50

30

20

100

10

20

8

5

4

3

2

10

0.8

0.5

0.3

0.2

1

0.1

20 30 50 10010 200 300 500 1000 2000 3000

80

50

40

30

20

5

3

2

10

1

-1° K-2° K

MAX

FLOW

PR

ES

SU

RE

DR

OP

S

SIZE 1/2" 131UM - 1131UM

SIZE 3/4" 131UM

[ kPa ]

0.01 0.02 0.03 0.05 0.1 0.2 0.3 0.5 1 2 3

[ l/h ]

[ m /h ]3

[ m bar ]

200

100

[ mm c.a. ]

2000

800

500

400

300

200

1000

50

30

20

100

10

20

8

5

4

3

2

10

0.8

0.5

0.3

0.2

1

0.1

20 30 50 10010 200 300 500 1000 2000 3000

80

50

40

30

20

5

3

2

10

1

pos 1 Kv 0.25

pos 2 Kv 0.60

pos 3 Kv 0.91

pos 4 Kv 1.18

pos 5 Kv 1.43 pos 6 Kv 1.64

pos 7 Kv 1.85

A Kv 2.60

FLOW

PR

ES

SU

RE

DR

OP

S

[ kPa ]

0.01 0.02 0.03 0.05 0.1 0.2 0.3 0.5 1 2 3

[ l/h ]

[ m /h ]3

[ m bar ]

200

100

[ mm c.a. ]

2000

800

500

400

300

200

1000

50

30

20

100

10

20

8

5

4

3

2

10

0.8

0.5

0.3

0.2

1

0.1

20 30 50 10010 200 300 500 1000 2000 3000

80

50

40

30

20

5

3

2

10

1

pos 1 Kv 0.25

pos 2 Kv 0.65

pos 3 Kv 0.88

pos 4 Kv 1.12 pos 5 Kv 1.30

pos 6 Kv 1.46

pos 7 Kv 1.57

A Kv 1.90

FLOW

PR

ES

SU

RE

DR

OP

S




1- 1

30U

M-1

31U

M-

GB

- 0

1/’0

2


E

AB

CD

130UM

B A

E

DC

131UM

E

A

BC

D

1130UME

B AD

C

1131UM

Size3/8”1/2”

A4953

B2626

C46.546.5

E3535

D24.524.5

Size3/8”1/2”3/4”

A495361

B202328

C404040

D181818

E353535

Size3/8”1/2”

A4953

B20,5 20,5

C4040

D1818

E3535

Size3/8”1/2”3/4”

A495361

B262934

C46.546.546.5

D24.524.524.5

E353535

THERMOSTATIC ACTUATORSTELESTAT SERIES 10C-20C-20CI

MAIN FEATURES

- Available in the following versions:- Series 10C : • NO (Normally open)• NC (Normally closed)• 2-wire (Standard)• 4-wire (With auxiliary contact)

- Series 20C/20CI : • 2-wire (Normally closed)• 4-wire (With position indicator)

- Compact size and reduced weight

- In accordance with the following standards :

•EEC EMC (CEI-EN 55104/95; CEI-EN 55014/93) Electromagnetic compatibility

•EI 60730-1/91 (CEI-IEC 730-2-9/92) (60335-1) Electrical safety

01A401-GB

10C220NC2 230V 15010C24NC2 24V 15010C220NC4 230V 20010C24NC4 24V 20010C220NA2 230V 15010C24NA2 24V 15010C220NA4 230V 20010C24NA4 24V 200

10CElectrothermic actuatorwith wax thermostatelement and auxiliarymicroswitch (only forversions NC4 and NA4).

Part No. Power supply Weight(g)

20C-220V 230V 15020C-24V 24V 150

20CElectrothermic actuator,compact size, with waxthermostat element,normally closed. Providedwith varistor to protectagainst surge in voltage.


20CI-220V 230V 15020CI-24V 24V 150

20CIElectrothermic actuator,compact size, with waxthermostat element, normally closed, completewith position indicator.Provided with varistor toprotect against surge involtage.


The electrothermic actuators of the 10C, 20C, 20CI Series,known as Telestat, are ON/OFF devices used for auto-matic actuation of the plugs on:

• Thermostat adaptable valves Series 178U,188UM, 102M, 120B• Reversed body valves Series 180M• Fan coil valves Series 2131, 3131, 4131 • Manifolds Series 822M

The electrothermic actuators are available in the followingversions:

• Series 10C- NO (normally open)- NC (normally closed)- 2-wire (standard)- 4-wire (with auxiliary contact)

• Series 20C, 20CI :- 2-wire (normally closed)

Both easy to fix on the valve body with a threaded ringnut.

The electrothermic actuators are designed to run on24V or 230V.

DESCRIPTION

The electrothermic actuators of the 10C, 20C, 20CI Series,are used in the ON/OFF control of the heat emission of theterminal units of heating and air conditioning systemsthrough an electrical signal transmitted by a room ortiming thermostat.

The use of electrothermic actuators, instead of thermo-static types, also allows remote control (pilot room); infact, the room or timing thermostat, or control compo-nent, can be situated in the most suitable point of eachroom to be regulated.

APPLICATION

Operation of the thermoelectric actuators 10C, 20C, 20CISeries, depends on a wax thermostatic element mountedin the actuators and activated by a PTC thermistor again-st a signal sent by a room thermostat (or timing thermo-stat).

When the thermostatic element expands, it supplies thethrust required for automatic movement of the plug.

The 4-wire version of the Series 10C, is provided with anauxiliary contact for additional commands (metering,control of pump, fan or other equipment).

The 20C and 20CI Series are provided with a varistor toprotect against surge in voltage.Moreover the Series 20CI is provided with a yellowposition indicator which moves between a red and bluenotch, visible on the transparent outer cap, thus signal-ling the open and closed position respectively of the valveon which it is installed.

Reliability of the electrothermic actuators 10C, 20C, 20CISeries is guaranteed thanks to the 100% testing of theproduction.

OPERATION Characteristics10C1) Thermostatic element2) Electrical resistor3) Opposing spring4) Ring nut5) Electrical microswitch6) Provision for sealing

Characteristics 20C - 20CI1) PTC Thermistor2) Element3) Return spring4) Thrust pin

1

3

5

6

4

2

1

2

3

4

The electrothermic actuators Series 10C, 20C, 20CI canbe selected according to the type of system, availablespace and type of power supply.In systems with 2-way control valves fitted withelectrothermic actuators it is advisable to install by-passvalves Series 466 or Series USVR to ensure a minimumrecirculation of the fluid.The actuators can be made tamper-proof by fitting a leadseal, especially for applications in heat metering systems.

Avoid installing the valve with the actuator facing down.

INSTALLATION

Electrical connections

10C - 2-wire

20C - 20CI

24V - 230V

1234

BrownBlue

0V

T12

24V - 230V

1234

Auxiliary Contact

0V

BrownBlueRedRed

T12

24V - 230V

1234

BrownBlue

0V

T12

10C - 4-wire

2 min

4 min

SPECIFICATION 20C - 20CIAction ON/OFFPower supply 24 - 230 VAC/DC (+10%/-15%)Frequency 0 to 60 HzPower rating during operation 5 WPeak starting current 0.5 A x 0.5 s (230V)

0.4 A x 30 s (24V)Operating time before valve starts opening 2 min Total valve opening time 4 min Max. actuator stroke 3.5 mmProtection class IP44Mains cable 1 m

2-pole x 0.75 mm2Ambient temperature 0 to 50°CStorage temperature -10 to 60°CThrust with stroke 0 mm > 70 NThrust with stroke 3.5 mm > 120 NCap ABS VO self-extinguishingValve connection Threaded ring nut M30x1.5

SPECIFICATION 10CAction ON/OFFPower supply 24 - 230 VAC/DC (+10%/-15%)Frequency 0 to 60 HzPower rating during operation 5 WPeak starting current 0.5 A x 0.5 s (230V)

0.4 A x 30 s (24V)Operating time starts closing (NO valve)

starts opening (NC valve)Total closing time (NO valve)Total opening (NC valve)Max. actuator stroke max 3.5 mmProtection class IP42 NC

IP44 NOMains cable 1 m

2-pole x 0.75 mm24-pole x 0.75 mm2

Ambient temperature 0 to 50°CStorage temperature -10 to 60°CThrust with stroke 0 mm > 70 NThrust with stroke 3.5 mm > 120 NAuxiliary microswitch (4-pole model) max 700 mACap ABS VO self-extinguishingValve connection Threaded ring nut M30x1.5




1- 1

0C-2

0C-2

0CI-

GB

- 0

1/’0

2


10C 20C - 20CI

AUTOMATICDISCHARGE

MANUALDISCHARGE

AUTOMATIC AIR VENT VALVESMANUAL VALVES

FOR DISCHARGING AIR FROM RADIATORS

MAIN FEATURES

ADVANTAGE OF BUILT-IN MANUAL DISCHARGE- Provision for controlling operation of

the automatic discharge by pressing the manual discharge pin.

- By holding down the manual discharge, water flows through the orifice thus facilitating cleaning of the automatic discharge mechanism.

- Rapid venting of air when filling the system.

01B101-GB

MXVMAXIVENT. Large capacity automatic airvent valve.

0253020 3/4”0253025 1”0253032 1.1/4”

Part No. SizeThe MAXIVENT valves are inspectable thanks to theopening left by the cover after unscrewing it from the tank;therefore it is also possible to clean the internal parts (floatand lever) in case of ingress of foreign matter in the valve.Tight seal between the tank and cover is thanks to thepresence of an NBR rubber seal.Long-term efficiency and performance of the ventmovement is ensured by the valve design features. Theseal system is designed to withstand vibrations, thereforeit is unaffected by any external vibrations.

DESCRIPTION

Valve opening and closing is determined by the floatmovement (up-down). When there is air in the MAXIVENT, the force of the floatweight acts on the lever which is integral with the plug,thus causing it to move down. In such situation the seatis free and allows the air to be vented outside.

When filling the system with water, the air entrapped inthe water circuit is pushed towards the outside via theMAXIVENT valve. As soon as all the entrapped air isdischarged, the water, entering the tank, pushes the floatup. Consequently the lever moves the plug to pressagainst the seat thus ensuring tight sealing of the system.

OPERATION

The MAXIVENT valve is normally installed:

- In the highest point of the air separator- At the top of the columns installed in heating systems

with expansion vessel- In all points where there is risk of air building up- At the top of the manifolds.

After installation, in order to allow perfect air venting,unscrew the protective cap by at least two turns (suchcondition ensures the vent characteristics as given in theprevious diagram).

INSTALLATION

Normally the MAXIVENT valve does not require routinemaintenance.

MAINTENANCE

Thanks to its particular size, the MAXIVENT valve findsapplication of automatic venting of air in large size waterdistribution pipes (e.g. distribution manifolds in thecentral system) and in all cases where it is necessary toeliminate large quantities of air from the system.The MAXIVENT valve is provided with manual air vent.

APPLICATION

DESIGN FEATURES

Body Cast iron G25 entirely coated with epoxy resin

Cover Cast iron G25 entirely coated with epoxy resin

Manual vent valve Chrome-plated brass OT 58

Lever Stainless steel

Plug NBR rubber

Float High density expanded polyethylene

Seals NBR rubber

Cap Brass OT 58

Inlet connection F 3/4" - 1" - 1 1/4" DIN-ISO 228/1

Outlet connection F 3/8" DIN-ISO 228/1, brass


Max. discharge pressure 6 bar

Max. operating pressure 12 bar

Min. seal pressure 0.1 bar

Max. operating temperature 115°C

Air d

isch

arge

rate

(NL/

min

)

Operating pressure (bar)

800

700

600

500

400

300

200

100

00 1 2 3 4 5 6

Air discharge rate - Operating pressure

Overall dimensions (mm)

MXV - 3/4”- 1” - 1.1/4”

MVDDUOVENT.Valve with double possibility of venting air from thesystem, either automaticallyor manually. The manual discharge alsoallows checking for correctoperation and cleaning theautomatic discharge orifice.

0250608 1/4”0250610 3/8”0250615 1/2”

Part No. Size

MVDRLike MVD but with automatic shut-off valve RIA.

0250708 1/4”0250710 3/8”0250715 1/2”

Part No. Size

The DUOVENT valves are inspectable by unscrewing thecover from the tank.

Tight seal between the tank and cover is thanks to thepresence of an O-ring; therefore it is also possible toclean the internal parts (float and lever) in case of ingressof foreign matter in the valve. Long-term efficiency andperformance of the vent movement is ensured by thevalve design features. The seal system is designed towithstand vibrations, therefore it is unaffected by anyexternal vibrations.

DESCRIPTION

During automatic operation, valve opening and closing isdetermined by the float movement (up-down). Whenthere is air in the DUOVENT, the force of the float weightacts on the lever which is integral with the plug, thuscausing it to move down. In such situation the seat is free and allows the air to bevented outside. When filling the system with water, the airentrapped in the water circuit is pushed towards the out-side via the DUOVENT valve.

As soon as all the entrapped air is discharged, the water,entering the tank, pushes the float up. Consequently thelever moves the plug to press against the seat thus ensu-ring tight sealing of the system.Manual venting is actuated by pushing down button (10);this can be done by exerting a pressure on the surface,for example with a screw driver. Such operation shiftshead (9) integral with O-ring (12) to a position lower thanthe seat, thus allowing air and/or water to flow alongstem. When water flows both from orifice (A) and (B),this indicates that all the air has been discharged from thesystem.

OPERATION

(comparison between manual and automatic venting)

The automatic venting characteristics are similar to MINIVENT. The following dia-gram shows the automatic and manual venting curves in relation to pressure,assuming a manual plug movement of 1.5 mm. It is clear that the manual ventingallows an appreciable increasing in the discharge rate of DUOVENT.

The DUOVENT valve is a development on the automaticMINIVENT valve. In fact DUOVENT has the same func-tions as MINIVENT, i.e. it is used for automatic venting ofair in water distribution pipes in order to avoid certainphenomena of damage (corrosion processes, cavitation)and loss of efficiency (air pockets in radiators) of theheating system, but it is provided with an additional devi-ce allowing manual air venting. The manual air vent devi-ce offers the following advantages:

a) It allows checking the valve for correct operation

b) It allows reducing times for discharging air from the system by increasing the discharge flow rate

c) Easier cleaning of the orifice by forcing water to flowthrough it.

The DUOVENT MVDR valve is provided with an automa-tic shut-off valve (Art. RIA) which allows removal of thevent valve without having to empty the system.

APPLICATION


DESIGN FEATURES

Body Brass OT 58

Cover Brass OT 58

Plug EPDM rubber

Spring Stainless steel

Cap Polyamide

Lever Polyacetal


Seals NBR rubber

Plug head Polyacetal

Plug button Polyacetal


Connections M 1/4" - 3/8" - 1/2" DIN - ISO 228/1

Air d

isch

arge

rate

(NL/

min

)


Manual air venting(plug movement of 1.5 mm)

Manual air venting80

40

240

280

320

400

360

200

160

120

00 1 2 3 4 5 6 7 8


Nominal pressure 12 bar



The DUOVENT valve is normally installed:- In the highest point of the air separator- At the top of the columns installed in heating systems

with expansion vessel- In all points where there is risk of air building up

In order to ensure maximum air venting efficiency, it isadvisable to install the DUOVENT valve in those pointswhere water speed is relatively low.After installation, in order to allow perfect air venting,unscrew the protective cap by at least two turns (suchcondition ensures the vent characteristics as given in theprevious diagram).

INSTALLATION

Normally the DUOVENT valve does not require mainte-nance. If maintenance is required, remove the valve; thepresence of shut-off valve RIA allows this operationwithout emptying the system.

MAINTENANCE


MVD

Air d

isch

arge

rate

(NL/

min

)Manual venting plug movement (mm)

150

120

90

60

30

00 1 2 30,5 1,5 2,5 3,5

(Pressure equal to 3 bar)

The flow rate in manual air venting varies according to the down movement ofthe plug, as shown in the following diagram, at a system pressure of 3 bar.


A. Automatic ventB. Manual vent1. Body2. Cover3. Plug4. Spring5. Cap6. Lever7. Float8. Seals9. Plug head

10. Button11. Spring12. Seals

12 11

B A

5

8

43

2

9

1

6

7

SIZE1/4”3/8”1/2”

CH191922

The MINIVENT valves are inspectable by unscrewing thecover from the tank. Tight seal between the tank and coveris thanks to the presence of an O-ring; therefore it is alsopossible to clean the internal parts (float and lever) in caseof ingress of foreign matter in the valve. Long-term effi-ciency and performance of the vent movement is ensuredby the valve design features. The seal system is designedto withstand vibrations, therefore it is unaffected by anyexternal vibrations.

DESCRIPTION

Valve opening and closing is determined by the floatmovement (up-down). When there is air in the MINIVENT,the force of the float weight acts on the lever which isintegral with the plug, thus causing it to move down. Insuch situation the seat is free and allows the air to bevented outside. When filling the system with water, the airentrapped in the water circuit is pushed towards theoutside via the MINIVENT valve. As soon as all the entrap-ped air is discharged, the water, entering the tank, pushesthe float up. Consequently the lever moves the plug topress against the seat thus ensuring tight sealing of thesystem.

OPERATION

The MINIVENT valve is normally installed:- In the highest point of the air separator- At the top of the columns installed in heating systems


In order to ensure maximum air venting efficiency, it isadvisable to install the MINIVENT valve in those pointswhere water speed is relatively low.After installation, in order to allow perfect air venting,unscrew the protective cap by at least two turns (suchcondition ensures the vent characteristics as given in theprevious diagram).

INSTALLATION

Normally the MINIVENT valve does not require maintenan-ce. If maintenance is required, remove the valve; the pre-sence of shut-off valve Art. RIA allows this operationwithout emptying the system.

MAINTENANCE

The MINIVENT valve is used for automatic venting of air inwater distribution pipes in order to avoid certain phenome-na of damage (corrosion processes, cavitation) and loss ofefficiency (air pockets in radiators) of the heating system.

The MINIVENT MVR valve is provided with an automaticshut-off valve (Art. RIA) which allows the vent valve to beremoved without having to empty the system.

The MINIVENT valve is used in independent, central,radiant panel heating systems, etc.

APPLICATION



MV

Air d

isch

arge

rate

(NL/

min

)


7065605550454035302520151050

0 1 2 3 4 5 6 7 8 9 10 11 12

1. Body2. Cover3. Lever4. Float5. Plug6. Spring7. Seals8. Cap

2

1

3

4

8

765

DESIGN FEATURES

Body Brass OT 58

Cover Brass OT 58

Lever Polyacetal


Plug EPDM rubber


Seals NBR rubber

Cap Polyamide

Connections M 1/4" - 3/8" - 1/2" DIN-ISO 228/1




MVMINIVENT.Automatic valve with vertical air vent.

0250008 1/4”0250010 3/8”0250215 1/2”

Part No. Size

MVRLike MV but with automaticshut-off valve RIA. 0250108 1/4”

0250110 3/8”0250115 1/2”

Part No. Size

SIZE1/4”3/8”1/2”

CH191922

1. Body2. Cover3. Float4. Plug5. End cap6. Lever7. Seals8. Spring9. Vacuum breaker

DESIGN FEATURES

Body Brass OT 58

Cover Brass OT 58


Plug Polyphenylene oxide

End cap Polyphenylene oxide, glass fibre reinforced

Lever Polyphenylene oxide, glass fibre reinforced

Seals NBR rubber


Vacuum breaker Polyacetal

Connections M 3/8" DIN - ISO 228/1




7 7 7

7

7

1

2

9

3

6

5

8

4

The MICROVENT valves are inspectable by unscrewingthe cover from the tank. Tight seal between the tank andcover is thanks to the presence of an O-ring; therefore itis also possible to clean the internal parts (float and lever)in case of ingress of foreign matter in the valve. Long-term efficiency and performance of the vent movement isensured by the valve design features. The seal system isdesigned to withstand vibrations, therefore it is unaffectedby any external vibrations.

The MICROVENT valve is provided with a vacuum breakertongue (close to the connection) designed for improvingthe air venting characteristics.However such vacuum breaker tongue is not fitted whenthe MICROVENT valve is supplied with shut-off valvewhich already incorporates the tongue.

DESCRIPTION

Valve opening and closing is determined by the floatmovement (up-down).When there is air in the MICROVENT, the force of the floatweight acts on the lever which is integral with the plug,thus causing it to move down. In such situation the seatis free and allows the air to be vented outside. When filling the system with water, the air entrapped inthe water circuit is pushed towards the outside via theMICROVENT valve. As soon as all the entrapped air isdischarged, the water, entering the tank, pushes the floatup. Consequently the lever moves the plug to pressagainst the seat thus ensuring tight sealing of the system.

OPERATION

The MICROVENT valve is normally installed:- In the highest point of the air separator- At the top of the columns installed in heating systems


In order to ensure maximum air venting efficiency, it isadvisable to install the MICROVENT valve in those pointswhere water speed is relatively low. After installation, inorder to allow perfect air venting, unscrew the protectivecap by at least two turns (such condition ensures the ventcharacteristics as given in the previous diagram). When itis necessary to mount a MICROVENT valve provided withvacuum breaker tongue on a RIA shut-off valve, merely liftout the tongue with two fingers.

INSTALLATION

Normally the MICROVENT valve does not require mainte-nance. If maintenance is required, remove the valve; thepresence of shut-off valve Art. RIA allows this operationwithout emptying the system.

MAINTENANCE

The MICROVENT valve is used for automatic venting ofair in water distribution pipes in order to avoid certainphenomena of damage (corrosion processes, cavitation)and loss of efficiency (air pockets in radiators) of theheating system.The MICROVENT MKVR and MKLR valves are providedwith an automatic shut-off valve (Art. RIA) which allowsthe vent valve to be removed without having to empty thesystem.

APPLICATION

MKVMICROVENT.Automatic valve with verticalair vent.

0251210 3/8”

Part No. Size

MKVRLike MKV but with automatic shut-off valve RIA.

0251310 3/8”

Part No. Size

MKLMICROVENT.Automatic valve with side air vent.

0252210 3/8”

Part No. Size

MKLRLike MKL but with automatic shut-off valve RIA.

0252310 3/8”

Part No. Size

Air d

isch

arge

rate

(NL/

min

)

Operating pressure (bar)0 1 2 3 4 5 6 7 8 9 10

MKV

MKL

50

45

40

35

30

25

20

15

10

5

0

Automatic shut-off valve RIA allows the air vent valves(MINIVENT, DUOVENT, and MICROVENT) to be removedwithout having to empty the system. The RIA shut-offvalve is fitted with a device for quick total emptying of thewater from the valve.

OPERATION

Air discharge rate - Operating pressure Overall dimensions (mm)

MKV - MKL

RIAAutomatic shut-off valve. 0259008 1/4” x 1/4”

0259010 3/8” x 3/8”0259015 1/2” x 1/2”

Part No. Size

SMMManual valve for ventingair from radiators withadjustable dischargenozzle, manual dischargeopening with handwheel.

0257106 1/8”0257108 1/4”0257110 3/8”0257115 1/2”

Part No. SizeDESIGN FEATURES

Body Brass OT 58, chrome-plated

Screw Brass OT 58, chrome-plated

O-ring NBR rubber





RIADESIGN FEATURES

Body Brass OT 58

Lever Polyphenylene oxide, glass fibre reinforced

Plug Polyacetal with O-ring


Connections M/F 1/4" - 3/8" - 1/2" DIN - ISO 228/1

SIZE1/4”3/8”1/2”

B888

C111111

CH191924




1- M

VD

- G

B -

01

/’02

The components and dimensional characteristics of thevalves allow a perfectly tight seal associated with veryeasy operation.

VMMManual valve for venting airfrom radiators with adjustabledischarge nozzle, manualdischarge opening eitherscrew driver or coin or wrench CH.

0256206 1/8”0256208 1/4”0256210 3/8”

Part No. Size

PMCManual valve for venting airfrom radiators with adjustabledischarge nozzle, manualdischarge opening eitherscrew driver or coin or wren-ch CH to avoid manual tam-pering.

0256306 1/8”0256308 1/4”0256310 3/8”0256315 1/2”

Part No. Size

RSRRadiator drain valve forquick and easy emptying ofthe water contained in theradiator, without requiringemptying the entire system.

0256008 1/4”0256010 3/8”0256015 1/2”

Part No. Size

CHWrench for valves RSR,VMM, PMC. 0256101

Part No.

DESIGN FEATURES

Body Brass OT 58, chrome-plated

Screw Brass OT 58, chrome-plated

Discharge nozzle Polyamide, reinforced withand handwheel glass fibre

O-ring NBR rubber




VMM

PMC

Inlet hole smaller thanthe outlet hole to avoidingress of particleswhich could block airdischarge.

Adjustable dischargenozzle, glass fibrereinforced nylon body.

O-ring for easyassembly and per-fectly tight seal onthe radiator.

Handwheel designed for manualopening with screw-driver, coinor wrench CH/VP. Limit stop onthe screw to avoid thehandwheel coming out from thevalve body.

Valve handwheel PMC with opening by screw-driver,coin or wrench CH/VP.

Wrench flat for adjustingdischarge nozzle body. Wrench CH/VP can be leftinserted on the body.

Slot for openingvalves PMC, RSR

Slot for openingvalve VMM.

CH/VP

AIR SEPARATORS AND DEAERATORS

01B201-GB

The water in air conditioning andheating systems contains a certainamount of dissolved air: the hightemperature and high speed offlow of the fluid causes separationof the air from the water. In closedcircuit systems such phenomenontakes place with the formation ofmicro air bubbles which move tothe top parts of the system and inthe points where the fluid flows atless speed.

Such presence of air causes various problems such as:• Increased deposit of scaling with consequent narrowing

of the pipe sections• Higher noise level in the systems• Lower heat exchange capacities• Increase in the rate of corrosion of the pipework


A

Hh

DD

L

∅ 49




Test pressure 12 bar

DESIGN FEATURES

Body Tropicalized sheet steel

Cover Shot blasted stamped brass OT58

Seals EPDM rubber

Springs Stainless steel AISI302

Float High density PE

Spiral mesh Stainless steel AISI304

Connections G 1" F DIN-ISO 228/1 (ERD25)G 1.1/2" F DIN-ISO 228/1 (ERD40)

Key:

1. Tank2. Cover3. Plug4. Torque spring5. Automatic vent plug6. Lever7. Float8. Cover seal ring9. Manual vent plug

10. Manual vent bushing11. Manual vent spring12. Seal ring, manual vent13. Manual vent plug14. Spiral mesh

Flow rate - Pressure drop chart

Flow rate (litres/min)

Pre

ssu

re d

rop

s (m

mW

G)

ERD40ERD25

1000

500

300

200

100

50

30

20

10

1 2 3 4 5 10 20 30 50 100 200 500 1000

Flow rate - Water speed chart

Flow

Wat

er s

pee

d (

m/s

)

ERD40ERD25

6,0

4,0

3,0

2,0

1,0

0,5

10 20 50 100 200 500 1000 [ l/min ]

0,6 1,0 2,0 5,0 10 20 50 100 [ m3/h ]

ERD

SIZE1”

1.1/2”

A50x5060x60

L94

104

H153191

h2632

ERDEUROVENT. Air separator with expansion vessel and double automatic/manualdeaerator.

0253625 1”0253640 1.1/2”

Part. No. SizeThe standard automatic air vent valves allow venting of aironly when the latter is separated from the water and accu-mulated in the topmost zones of the system. The ERDdeaerator allows reduction in speed with consequentaggregation of the air in maxi bubbles and the automaticventing of such air.

DESCRIPTION

APPLICATIONThe EDR is used for discharging air:

- In circuits with circulator, at the highest point of the pipework to reduce noise and to increase efficiency

- In radiant panel systems because the presence of air would reduce the efficiency of the panels

- In air conditioning system to avoid entrapping of air in the heat exchangers.

SELECTION CRITERIAAcceptable speed of water in heating-water-plumbingsystems is between 1 and 2 m/s, therefore ERD25 is usedfor flow rates up to 60 litres/min, while ERD40 is used forflow rates up to 150 litres/min. Higher flow ratesdetermine higher speeds with consequent less air ventingcapacity.

OPERATIONPrinciple of operation of the ERD air separator is asfollows:

- The speed of the fluid is reduced inside the device- The reduction in speed and the presence of the internal

spiral mesh leads to separation of the micro air bubbles dispersed in the water

- The micro bubbles, on coming into contact with the mesh, aggregate and tend to be conveyed to the top of the body, from where they are discharged by the automatic valve.

Vent capacity

Pressure (bar)

Air

flo

w r

ate

(kg

/h)

ERD25

2,0

1,5

1,0

0,5

0

2,0 2,2 2,4 2,6 2,8 3,0 3,2 3,4 3,6 3,8 4,0

2,5

Wat

er f

low

rat

e (l

itre

s/m

in)

60

30

Vent capacity

Pressure (bar)

Air

flo

w r

ate

(kg

/h)

Wat

er f

low

rat

e (l

itre

s/m

in)

ERD40

2,5

1,5

1,0

0,5

0

2,0 2,2 2,4 2,6 2,8 3,0 3,2 3,4 3,6 3,8 4,0

3,0

150

75

2,0

SA Air separators with 5 threaded instrument connections. 0260125 1”

0260132 1.1/4”0260140 1.1/2”0260150 2”0260165 2.1/2”0260180 3”

Part. No. Size

SAF Flanged air separators with automatic deaerator connection, complete withcounter-flange, bolts and seals.

0260200 1000260225 125

Part. No. Size




1- E

RD

-SA

-SA

F -

GB

-

01/’

02

DESIGN FEATURES

Body, separator SA Painted malleable cast iron

Body, separator SAF Painted steel

Connections, SA Threaded DIN-ISO 228/1

Connections, SAF100 Flanged NP6-UNI 2276 with

counter flange, bolts and seals

Connections, SAF125 Flanged NP10-UNI 2276 with counter flange, bolts and seals

APPLICATIONFrom the critical water speed diagram, it can be deducedthat separation of air from water can only take place whenthe speed of the water lies below the critical speed value.Such value depends on the pipe diameter, on the slope ofthe latter referred to the horizontal plane (counter slope)and the water temperature.Air separators SA and SAF provide the most suitable con-ditions as regards the characteristics of the above mentio-ned points:

- Increase in full flow (reduction in speed)

- Zero counter slope (horizontal flow) with partial deviationtowards the top owing to the internal fins

- High temperature (determined by the positioning in thevicinity of the boiler).

Hence the air collects at the highest point of the separatorwhere an automatic air vent valve is installed (Minivent,Intervent, Microvent or Maxivent). For increased efficiencyof the separator, the latter should be preceded by a straightlength of piping.

Flow rate - Pressure drop chart

Flow rate (litres/h)

Pre

ssu

re d

rop

(m

m W

G)

SA25 40

100

50

20

10

5,0

2,0

1,0

100 200 500 1.000 2.000 5.000 10.000 20.000 50.000

SA50

SA65-80 SAF100-125

H

D

L

B

3/8” A

DC

1/ 2”

1/ 2”

D

L

B

A

H

Key:

A. safety valve connection (VST, MSL, SV)B. expansion vessel connection3/8" automatic air vent valve connection (MV, MKV, MKL, INT)1/2" thermometer- gauge connection (TMAX)



SA

SAF SIZE1

1.1/4”1.1/2”

2”2.1/2”

3”

A1/2”1/2”1/2”3/4”1”1”

B3/4”3/4”3/4”1”1”1”

C70707087

128128

L152152152189300300

H878787

115203203

SIZE100125

APN6PN10

B3/4”1”

L600700

H156168

Q14,523,0

APPROVED AND CALIBRATEDSAFETY VALVES

STANDARD SAFETY VALVE

I.S.P.E.S.L. APPROVEDAND CALIBRATED SAFETYVALVES

The VST safety valves for heatingsystems are designed in accordancewith the requirements of Body R edition1982, technical specification, of ItalianD.M. 1.12.75. Verification of the para-meters and experimental determinationof the discharge coefficient have beencarried out in the presence of anI.S.P.E.S.L officer.The VST safety valves find application inheating systems with expansion vessel.

01C051-GB

STANDARD SAFETY VALVESThese are safety valves not submitted to experimental determination.They may be used in plumbing, water and heating systems with capa-city lower than 30,000 kcal/h not covered by the regulations in accor-dance with Italian D.M. 01.12.1975

VSTDiaphragm safety valvewith fixed setting. FFconnections with largesize outlet.

I.S.P.E.S.L. approved.

0212122 1/2” x 3/4” 2,250212125 1/2” x 3/4” 2,50212127 1/2” x 3/4” 2,70212130 1/2” x 3/4” 30212135 1/2” x 3/4” 3,50212140 1/2” x 3/4” 40212145 1/2” x 3/4” 4,50212150 1/2” x 3/4” 50212154 1/2” x 3/4” 5,40212160 1/2” x 3/4” 6

0213122 3/4”x 1” 2,250213125 3/4”x 1” 2,50213127 3/4”x 1” 2,70213130 3/4”x 1” 30213135 3/4”x 1” 3,50213140 3/4”x 1” 40213145 3/4”x 1” 4,50213150 3/4”x 1” 50213154 3/4”x 1” 5,40213160 3/4”x 1” 6

0214122 1”x 1.1/4” 2,250214125 1”x 1.1/4” 2,50214127 1”x 1.1/4” 2,70214130 1”x 1.1/4” 30214135 1”x 1.1/4” 3,50214140 1”x 1.1/4” 40214145 1”x 1.1/4” 4,50214150 1”x 1.1/4” 50214154 1”x 1.1/4” 5,40214160 1”x 1.1/4” 6

Part No. Size barDiaphragm safety valves for heating systems, manufactu-red in accordance with Body R 1982 edition (R.2.A.2),carrying the certificate of I.S.P.E.S.L. approval issued afterexperimental tests to determine the discharge coefficientconducted at Milan Polytechnic University - Italy.

DESCRIPTION I.S.P.E.S.L. APPROVED AND CALIBRATED SAFETY VALVES

The overall flow rate of the safety valve should be suchas to discharge an hourly quantity of liquid equal to:

W = P/ i where W = Discharge rate in kg/h P = Nominal capacity of the

boiler in kcal/hi = heat of vaporization

conventionally assumed to be 500

N.B. For boilers higher than 580 kW (500,000 kcal) incapacity, the discharge rate should be subdivided over atleast two safety valves (R.3.B.7.3).

SIZING

"Increase in pressure over the set pressure to allow thedisc to complete the lift" (R.2.A.2.1.8) is, for the VSTvalves, < 10% of the set pressure.

OVERPRESSURE

"Lowering of the pressure below the set pressure neces-sary to close the valve" (R.2.A.2.1.9) is, for the VSTvalves, < 20% of the set pressure.

BLOWDOWN

Diameter of the discharge piping has been increased lar-ger, as specified by the most advanced European stan-dards; this characteristic, together with the use of adischarge tundish (Art. IS) allows the valve to operateunder optimum conditions by having the discharge atatmosphere backpressure.

DISCHARGE PIPING

The VST safety valves "should be connected to the highe-st part of the boiler or to the outlet piping in the immedia-te vicinity of the boiler. The length of the piping betweenthe connection to the boiler and the safety valve must notbe greater than one metre" (R.3.B.2.4)."It should not be possible to shut off the connecting pipingbetween the safety valve and the boiler nor should thispiping have a section, at any point, under that of the safetyvalve inlet port..." (R.3.B.2.5). The discharge piping"should be engineered so as not to prevent the regularvalve operation and not to cause injury to persons"(R.3.B.2.6). The diameter of the discharge piping shouldnever be smaller than that of the outlet fitting from thesafety valve".

INSTALLATION

DESIGN FEATURESBody and cap Brass CuZn40Pb2 DIN17660 stamped

and shot-blasted

Diaphragm and seal EPDM rubber for temperatures up to 140°C

Manual discharge knob High impact plastic

Spring Galvanized steel C100

Disc, stem and other parts Brass CuZn40Pb2 DIN17660 drawn and machined

All safety valves model VST are supplied complete with Factory-calibrated Report,undersigned by an I.S.P.E.S.L. engineer.

Key:1. Body2. Cap3. Diaphragm4. Disc5. Setting nut6. Manual discharge knob7. Spring

5

4

3

2

1

6

7

To ensure perfect efficiency, the safety valves requireperiodic inspection. In a system where the safety valveremains idle, there is risk of foreign matter building upover time close to the disc; therefore the valve seatshould be flushed periodically. Such flushing is obtainedthrough a manual discharge of the valve by turning theknob in the direction indicated by the arrows.Almost all leaks (dripping, incomplete closing) are cau-sed by impurities lodged between the seat and disc;hence periodic inspection and flushing prevent such leaksand related difficulties.

MAINTENANCE

Approval according to Body R (June 1982 edition).Factory-calibrated certificate issued by I.S.P.E.S.L.

In order not to impair correct valve operation, it is recom-mended not to install an elbow in the pipework, rather apipe bent with a radius equal to at least 3 times the dia-meter of the actual pipework. Discharge should be throu-gh an appropriate siphon or vessel so as to allowchecking for opening of the valve.

APPROVALS

PRESSURE (bar) Orifice CAPACITYMODEL Ø Section K

set discharge closing mm cm2 kg/h kcal/h kW KJ/h

TECHNICAL CHARACTERISTICS AND DISCHARGE RATES WITH OVERPRESSURE 10% AND BLOWDOWN 20%

SIZE1/2” x 3/4”3/4” x 1”

1” x 1.1/4”

L374854

H119165173

h2529

34,5

VST


15 1,7671 0,71

20 3,1416 0,80

25 4,9087 0,71

VST15/22 2,25 2,475 1,80 205,67 102.839 119,29 430.484

VST15/25 2,50 2,75 2,00 221,40 110.703 128,41 463.340

VST15/27 2,70 2,97 2,16 233,78 116.892 135,59 489.309

VST15/30 3,00 3,30 2,40 253,74 126.873 147,17 531.090

VST15/35 3,50 3,85 2,80 284,07 142.035 164,76 594.558

VST15/40 4,00 4,40 3,20 318,07 159.039 184,48 665.737

VST15/45 4,50 4,95 3,60 344,78 172.393 199,97 721.637

VST15/50 5,00 5,50 4,00 376,39 188.196 218,30 787.788

VST15/54 5,40 5,94 4,32 399,70 199.850 139,04 836.572

VST15/60 6,00 6,60 4,80 442,81 221.407 256,83 926.809

VST20/22 2,25 2,475 1,80 412,01 206.006 238,96 862.341

VST20/25 2,50 2,75 2,00 443,52 221.760 257,24 928.287

VST20/27 2,70 2,97 2,16 468,31 234.156 271,62 980.177

VST20/30 3,00 3,30 2,40 508,30 254.151 294,81 1.063.876

VST20/35 3,50 3,85 2,80 569,04 284.522 330,04 1.191.009

VST20/40 4,00 4,40 3,20 637,17 318.585 369,55 1.333.596

VST20/45 4,50 4,95 3,60 690,67 345.336 400,58 1.445.576

VST20/50 5,00 5,50 4,00 753,98 376.992 437,31 1.578.028

VST20/54 5,40 5,94 4,32 804,25 402.125 466,50 1.683.295

VST20/60 6,00 6,60 4,80 887,04 443.520 514,48 1.856.574

VST25/22 2,25 2,475 1,80 571,37 285.670 331,37 1.195.814

VST25/25 2,50 2,75 2,00 615,03 307.515 356,71 1.287.257

VST25/27 2,70 2,97 2,16 649,41 324.705 376,65 1.359.215

VST25/30 3,00 3,30 2,40 704,86 352.433 408,82 1.475.284

VST25/35 3,50 3,85 2,80 789,09 394.548 457,67 1.651.577

VST25/40 4,00 4,40 3,20 883,56 441.783 512,46 1.849.303

VST25/45 4,50 4,95 3,60 957,75 478.879 555,49 2.004.587

VST25/50 5,00 5,50 4,00 1045,55 522.776 606,42 2.188.340

VST25/54 5,40 5,94 4,32 1120,24 560.117 649,79 2.344.650

VST25/60 6,00 6,60 4,80 1230,06 615.031 713,43 2.574.519

Safety valves to be used in heating systems, for which noexperimental determination is carried out are defined asstandard valves. In the calculation formula, the value of0.9K, i.e. equal to 0.05 (R.2.A.2.3.4) should be assumed.In this way the regulations drastically reduce this applica-tion limits for standard safety valves in the heating field.Furthermore systems with capacity less than 35 kW(30,000 kcal/h) are not subject to the regulations coveredby Italian D.M. 1.12.1975.

W =

where : A = net valve orifice section in cm2M = factor to be taken from the table

in Body R (R.2.A.2.3)W = steam venting capacity in kg/h

HEATING SYSTEMS

Body R, containing technical application requirements ofItalian D.M. 1.12.1975, indicates the sizing criterion forsafety valves to be used in protecting heaters for dome-stic hot water. Orifice of such safety valves should havea diameter D no smaller than:

where : D = net valve orifice diameter in mm

V = water heater volume in litres

PLUMBING SYSTEM

The safety valves are factory calibrated with a setpressure. The setting is given on the tag attached to thetop of the manual discharge knob.

CALIBRATION

UDT (only MSL/E30)AFNOR / CSTB (MSML/E-OM30 and MSM/E-OM30).TÜV / TSUP (SVH - SVW)

APPROVALS

To ensure perfect efficiency, the safety valves requireperiodic inspection. In a system where the safety valveremains idle, there is risk of foreign matter building upover time close to the disc; therefore the valve seat shouldbe flushed periodically. Such flushing is obtained througha manual discharge of the valve by turning the knob in thedirection indicated by the arrows.Almost all leaks (dripping, incomplete closing) are causedby impurities lodged between the seat and disc; henceperiodic inspection and flushing prevent such leaks andrelated difficulties.

MAINTENANCE

MSLStandard diaphragm safetyvalve. Inlet connection 1/2"M and outlet 1/2" F.

MSL, set at 3 bar,conforms with UDT and isAFNOR/CSTB approved.

0206525 1/2" 2,50206530 1/2" 30206160 1/2" 60206170 1/2" 70206180 1/2" 80206190 1/2" 90206199 1/2" 10

Part No. Size bar

MSVLike MSL, but with inletconnection 1/2" F and outlet 1/2" F.

0207110 1/2" 10207115 1/2" 1,50207525 1/2" 2,50207530 1/2" 30207160 1/2" 60207170 1/2" 70207180 1/2" 80207190 1/2" 90207199 1/2" 10

Part No. Size bar

SVStandard diaphragm safetyvalve. Female connectionswith increased outlet.

Settings at 4-7-8 bars arealso available on request.

TÜV/TSUP approved.

0215104 1/2" x 3/4" 40216108 1/2" x 3/4" 80216110 1/2" x 3/4" 10

0217625 3/4" x 1" 2,50217630 3/4" x 1" 30217206 3/4" x 1" 60217210 3/4" x 1" 10

0218325 1" x 1.1/4" 2,50218330 1" x 1.1/4" 30218306 1" x 1.1/4" 60218310 1" x 1.1/4" 10

0219425 1.1/4" x 1.1/2" 2,50219430 1.1/4" x 1.1/2" 30219406 1.1/4" x 1.1/2" 60219410 1.1/4" x 1.1/2" 10

Part No. Size bar

DESIGN FEATURES

Body and cap Brass CuZn40Pb2 DIN17660 stamped and shot-blasted

Manual discharge knob Reinforced nylon

Diaphragm and seal Ethylene-polypropylene

Spring Special galvanized steel

Disc, stem and other parts Brass CuZn40Pb2 DIN17660 turned from barstock

Key:1. Body2. Cap3. Diaphragm bushing4. Knob5. Diaphragm6. Spring7. Tag

D = √

0,9xKxA0,005xM

V5

5

43

2

1

6

7


1,0 1,1 0,8

1,5 1,7 1,2

2,0 2,2 1,6

2,5 2,8 2,0

3,0 3,3 2,4

3,5 3,9 2,8

4,0 4,4 3,2

4,5 5,0 3,6

6,0 6,6 4,8

7,0 7,7 5,6

8,0 8,8 6,4

9,0 9,9 7,2

10,0 11,0 8,0

MSL PRESSURE Orifice Orifice Kv DISCHARGE CAPACITY

MSV set discharge closing Diameter Section kg/h kcal/h kW kJ/h

SV (bar) (bar) (bar) (mm) (mm2)

1/2” 13,5 143,14 0,57 82,0 41.023 47,5 171.639

3/4” 14 153,94 0,66 102,2 51.084 59,2 213.735

1” 20 314,16 0,84 265,4 132.684 153,7 555.151

1”1/4 30 706,86 0,49 348,3 174.148 201,8 728.636

1/2” 13,5 143,14 0,57 104,9 52.451 60,8 219.453

3/4” 14 153,94 0,66 130,6 65.315 75,7 273.276

1” 20 314,16 0,84 339,3 169.646 196,6 709.801

1”1/4 30 706,86 0,49 445,3 222.661 258,0 931.613

1/2” 13,5 143,14 0,57 123,4 61.707 71,5 258.180

3/4” 14 153,94 0,66 153,7 76.841 89,0 321.501

1” 20 314,16 0,84 399,2 199.584 231,3 835.059

1”1/4 30 706,86 0,49 523,9 261.954 303,5 1.096.016

1/2” 13,5 143,14 0,57 145,4 72.704 84,2 304.193

3/4” 14 153,94 0,66 181,1 90.535 104,9 378.798

1” 20 314,16 0,84 470,3 235.153 272,5 983.882

1”1/4 30 706,86 0,49 617,3 308.639 3 57,6 1.291.345

1/2” 13,5 143,14 0,57 165,0 82.507 95,6 345.207

3/4” 14 153,94 0,66 205,5 102.742 119,1 429.872

1” 20 314,16 0,84 533,7 266.860 309,2 1.116.540

1”1/4 30 706,86 0,49 700,5 350.253 405,9 1.465.459

1/2” 13,5 143,14 0,57 185,9 92.950 107,7 388.904

3/4” 14 153,94 0,66 231,5 115.747 134,1 484.287

1” 20 314,16 0,84 601,3 300.639 348,4 1.257.874

1”1/4 30 706,86 0,49 789,2 394.589 457,2 1.650.960

1/2” 13,5 143,14 0,57 206,8 103.424 119,8 432.725

3/4” 14 153,94 0,66 257,6 128.789 149,2 538.854

1” 20 314,16 0,84 669,0 334.514 387,6 1.399.607

1”1/4 30 706,86 0,49 878,1 439.050 508,7 1.836.984

1/2” 13,5 143,14 0,57 225,9 112.970 130,9 472.669

3/4” 14 153,94 0,66 281,4 140.677 163,0 588.595

1” 20 314,16 0,84 730,8 365.392 423,4 1.528.801

1”1/4 30 706,86 0,49 959,2 479.577 555,7 2.006.552

1/2” 13,5 143,14 0,57 288,0 143.982 166,8 602.421

3/4” 14 153,94 0,66 358,6 179.295 207,8 750.170

1” 20 314,16 0,84 931,4 465.696 539,6 1.948.472

1”1/4 30 706,86 0,49 1222,5 611.226 708,3 2.557.370

1/2” 13,5 143,14 0,57 330,0 165.013 191,2 690.415

3/4” 14 153,94 0,66 411,0 205.484 238,1 859.745

1” 20 314,16 0,84 1067,4 533.719 618,4 2.233.080

1”1/4 30 706,86 0,49 1401,0 700.506 811,7 2.930.918

1/2” 13,5 143,14 0,57 367,2 183.577 212,7 768.086

3/4” 14 153,94 0,66 457,2 228.601 264,9 956.466

1” 20 314,16 0,84 1187,5 593.762 688,0 2.484.302

1”1/4 30 706,86 0,49 1558,6 779.313 903,0 3.260.646

1/2” 13,5 143,14 0,57 389,6 194.777 225,7 814.946

3/4” 14 153,94 0,66 485,1 242.547 281,1 1.014.818

1” 20 314,16 0,84 1260,0 629.987 730,0 2.635.864

1”1/4 30 706,86 0,49 1653,7 826.857 958,1 3.459.572

1/2” 13,5 143,14 0,57 458,9 229.471 265,9 960.108

3/4” 14 153,94 0,66 571,5 285.751 331,1 1.195.583

1” 20 314,16 0,84 1484,4 742.203 860,0 3.105.377

1”1/4 30 706,86 0,49 1948,3 974.141 1128,8 4.075.808




1- V

ST

- G

B -

01

/’02

SIZE1/2” x 3/4”3/4” x 1”

1” x 1.1/4”1.1/4” x 1.1/2”

H75

86,5189204

h24,5344043

L34375560

MSL/MSV SV


AUTOMATIC FILLING VALVESAUTOMATIC FILLING UNITS

01C301-GB

RELIABILITY AND COMFORT

The Watts Cazzaniga ALIMAT automaticfilling valve ensures prompt automaticmake up of water losses from theheating system by highly accurateand reliable adjustment of the heatingsystem pressure until reaching therequired operating parameter.

EASY FILLING

The use of the Watts Cazzaniga ALIMAT filling valve allows fully automatic filling of water in the system with appreciable timesaving.

PROTECTION

The Watts Cazzaniga ALIMAT automatic filling valve includes aninspectable check valve whose function is to prevent risk of backflows which could cause contamination of the water main with thewater of the heating system. When an even higher level of safety isrequired, Watts Intermes offers filling and back flow preventer unitsfor systems with capacities either higher or lower than 70 kW.

Flow rate - pressure drop chart

AL - ALM - ALO - ALOM

ALALIMAT.Automatic filling valve complete with check valve,manual shut-off, stainlesssteel filter, vent screw.

0240100 1/2”MF

Part No. Size

ALMLike AL but with pressuregauge MR50 (dial 50 mm,radial connection, 0-4 bar).

0240200 1/2”MF

Part No. Size

ALOLike AL but with cap made ofbrass CW617N. 0240110 1/2”MF

Part No. Size

ALOMLike ALO but with pressuregauge MR50 (dial 50 mm,radial connection, 0-4 bar).

0240210 1/2”MF

Part No. Size

A closed circuit heating system should be connected tothe water main via a valve ensuring the following condi-tions:

- a filling pressure suitable for system requirements;- protection against risk of back flow which could cause

pollution of the water main;- stop of water filling upon reaching a preset pressure.

Such conditions are guaranteed by the ALIMAT automa-tic filling valve which combines the following functions:

- pressure control;- non-return;- checking for correct check valve operation;- shut-off ;- filtration;- check of heating system pressure via pressure gauge.

APPLICATION

4

PR

ES

SU

RE

DR

OP

S

FLOW RATES

[bar]

3,5

3

2,5

2

1,5

1

0,5

0

0 0,2 0,4 0,6 0,8 1 1,2 1,4 1,6 1,8 [ m3/h]


Key:1. Inlet connection2. Setting pin3. Spring4. Plug5. Diaphragm6. Check valve7. Vent8. Knob9. Filter cartridge10. Chamber

1

2

3

4

5

6

6

7

89

10

E U

DESIGN FEATURES

Body and head end Nickel-plated brass

Body Shot-blasted stamped brass

Diaphragm NBR rubber reinforced with nylon fabric

Inlet connection 1/2" M tailpiece (UNI-ISO228/1)

Outlet connection 1/2" F (UNI-ISO228/1)

Gauge connection 1/4" F (UNI-ISO228/1)

O-rings NBR rubber

Cap (AL-ALM) High impact plastic

Cap (ALO-ALOM) Die-cast brass


Max. inlet pressure 10 bar

Set pressure 0,3 to 4 bar

Max. flow rate 1,8 m3/h

Operating sensitivity 0,2 bar

Max. fluid temperature 40°C

In order to avoid uncontrollable feeding of water in thesystem, which would prevent leak detection, it is recom-mended, once filling has finished, to close the shut-offvalve. The pressure gauge will show any leaks which,whenever of continuous nature, should be promptlyidentified and eliminated.

OPERATIONWhen the pressure exerted by the fluid inside the systemdrops below the pressure exerted by spring (3) on diaph-ragm (5), the spring pushes plug (4) down. The mainswater flows via inlet (E) through filter cartridge (9), thenrises into chamber (10), opens check valve (6) and thusflows towards the system (U). When filling of the systemis complete, the pressure in it increases, and therefore inchamber (10). After exceeding the value balanced by theforce exerted by the opposing spring the pressure pushesdiaphragm (5) upwards while plug (4) closes. Checkvalve (6) prevents back flow. Hence the pressure settlesaccording to the set pressure given by the spring.

SETTINGThe ALIMAT automatic filling valve is set by turning screw (2):- towards + (clockwise) = to increase the pressure;- towards - (counter-clockwise) = to decrease the pressure.

Pressure of the system can be checked on the pressuregauge.

CONTROL OF CHECK VALVE FOR PRESSURETIGHTNESS The ALIMAT automatic filling valve is able to control the pressure tightness ofthe check valve. For such purpose, after closing knob (8), slightly loosen (2 or 3turns) vent screw (7): if there is faulty sealing of the check valve, there would bea continuous loss of water. After controlling, fully tighten the vent screw andagain open the knob.

MAINTENANCELa manutenzione dell’alimentatore automatico ALIMAT si limita alla pulizia perio-dica del filtro, in particolare dopo il primo riempimento dell’impianto. Per estrarre il filtro procedere come segue:

1. Close the gate valve upstream to ALIMAT (if there is no gate valve, shut off the supply pipe from the water main).

2. Unscrew the bottom nut and remove the knob assembly (8) where filter (9) is seated.

3. Flush the filter with water (do not use aggressive chemicals).

4. Grease the O-rings mounted on plug (4).

5. Refit the filter and spring in the seat in the bottom nut, then fully tighten the nut to the body.

6. Re-open the gate valve upstream to ALIMAT or the one before the system.

ALOMDIWFilling and back flow preven-ting unit, complete withdischarge tundish, assembledfor air conditioning and hea-ting systems with capacity > 79 kW.

1505199 1/2”

Part No. Size

ALOMDNWFilling and back flow preven-ting unit, complete withdischarge tundish, assembledfor air conditioning and hea-ting systems with capacity < 70 kW.

1505299 1/2”

Part No. Size

Risk of pollution of drinking water pipes is a factor not beunderestimated.

There are regulations prescribing preventive measure-ments against contamination of drinking water: amongthese, UNI 9157 - "Three-way back flow preventers" liststhe circuits and/or appliances whose direct connection tothe public water main is recognized as possible source ofpollution; hence the use of a back flow preventing unit isprescribed:

- independent and central heating systems;

- air conditioning and air treatment systems.

In order to protect public drinking water mains, a fillingand back flow preventing is a useful device for connec-tion to the heating system.

This unit combines both functions of protection andautomatic feeding of the system.

APPROVALSThe following approvals refer to the back flow preventersonly:

- DIW009: UNI certification according to UNI 9157standardCertificationsNF/ANSEAU/KIWA/DVGW/ASSE/AWWA/IAPMO

- DNW9D:Certifications ANSEAU/KIWA/ASSE/CSA

APPLICATION

DESIGN FEATURES

Ball valve body Nickel-plated stamped brass

Ball valve seats PTFE

Inlet connection 1/2" F (UNI-ISO228/1)

Outlet connection 1/2" F (UNI-ISO228/1)

Gauge connection 1/4" F (UNI-ISO228/1)


Max. inlet pressure 10 bar

Set pressure 0.3 to 4 bar

Max. flow rate 1.8 m3/h with set pressure 4 bar

Operating sensitivity 0.2 bar





1- A

L- D

IW -

DN

W -

GB

-

01/’

02


Flow rate - pressure drop chart

4[bar]

3,5

3

2,5

2

1,5

1

0,5

0

0 0,2 0,4 0,6 0,8 1 1,2 1,4 1,6 1,8 [ m3/h]

ALOM DNW

ALOM DIW

PR

ES

SU

RE

DR

OP

S

FLOW RATES

ALOMDIW ALOMDNW

FLOAT SWITCHESFLOW SWITCHES FOR LIQUIDS

PRESSURE SWITCHES

01D351-GB

DOLOMIT FLOAT SWITCHESThe DOLOMIT float switches find

application in liquid level control in

tanks and wells; they require con-

nection to pumps (or other electrical

equipment). They can be used with

drinking water and sewage as well

as other liquids compatible with the

components of the products.

FLOW SWITCHES FOR LIQUIDSFlow switches interrupt an electrical control circuit when the water

circulation fails in the circuit for some abnormal condition (e.g. stop-

ping of motor-driven pumps). They are operated thanks to a blade-

type electrical tripping device (stainless steel blade).

PRESSURE SWITCHESThe PRM pressure switch is with normally closed contacts; when the

pressure of the system exceeds the set pressure, the contacts are

opened thus interrupting the circuit.

The series PA pressure switch automatically controls operation of the

motor-driven pump in accordance with the fixed set pressures.

IGDDOLOMIT.Float switch for liquid level controlin tanks.

0420202 2 m0420203 3 m0420205 5 m0420210 10 m

Part No. Cable L.Float switch Series IGD finds application in liquid levelcontrol in tanks and wells; it requires connection topumps (or other electrical equipment). The float switchcan be used with drinking water and sewage as well asother liquids compatible with the components of theproduct. Float switch Series IGD is spray and dust proofthanks to a double sealing obtained by injection mouldingusing the same material of construction for the body (nontoxic polypropylene).Product reliability is ensured thanks to the sound expe-rience of WATTS Cazzaniga in the sector as well as to thestringent testing programme to which both the processand product are submitted.

APPLICATION

It is important to make sure that they are no objects impe-ding the float movement. If necessary, adjust the float armby suitably positioning it with relative counterweight.It is good practice to position the float on the sideopposite to liquid inlet.

Electrical connection:

The three-pole cable (cable colour: Blue - Brown - Black)allows float switch Series IGD to be used for emptying orfilling depending on the electrical connections asdescribed below:

- Emptying / Black - Brown connection / contact closes with float at top

- Filling / Black - Brown connection / contact closes with float at bottom.

INSTALLATION AND ELECTRICALCONNECTIONS

Float switch Series IGD can be used either for filling oremptying tanks and wells.The important factor is the length of the rotating armwhich determines the minimum and maximum liquidlevels. For such purpose, the arm length can be shortenedusing the appropriate counterweight (CP/NSD).Figures 1 and 2 illustrate the operation.

OPERATION

CE mark in conformity with European Directives EEC89/336, EEC 73/23.

APPROVALS

Fig. 1

Fig. 2


EMPTYING

FILLING

ON

P OFF

ON

OFF

ON

OFF

DESIGN FEATURES

Body Non toxic polypropylene

Cable PVC - A05.VV-F / Neoprene - H07.RN-F (*)

Conductor size 1 mm2

(*) cable 3 x 1 available with other lengths


Contact load rating 16 (4) A at 250 V~


Storage temperature range -20°C ÷ +80°C

Type of electrical duty Light

Degree of protection IP 67 (immersion proof )

Switching angle -45° ÷ +48°

Electrical insulation class II

Dimensions 91 x 129 x 40 mm

Weight 143 g

Volume 254 cm3

FILLING

ON

OFF

CE mark in conformity with European Directives EEC 89/336, EEC 73/23.

APPROVALS

DESIGN FEATURES

Body Non toxic polypropylene

Cable PVC - A05.VV-F / Neoprene - H07.RN-F (*)

Conductor size 1 mm2

Conductor size 16 (4) A at 250V~ (**)

(*) cable 3 x 1 available with other lengths

(**) also available in the version with microswitch 20 (8) A at 250V~


Contact load rating 16 (4) A at 250 V~


Storage temperature range -20°C ÷ +80°C

Type of electrical duty Light

Degree of protection IP 67 (immersion proof )

Switching angle -45° ÷ +45°

Electrical insulation class II

Dimensions 73 x 99 x 37 mm

Weight 89 g

Volume 155 cm3

IGMMICRO-IGM.Compact float switch forliquid level control in tanks.

0424020 2 m0424030 3 m0424050 5 m0424091 10 m

Part No. Cable L.Float switch Series IGM finds application in liquid levelcontrol in tanks and wells; it requires connection topumps (or other electrical equipment).The float switch can be used with drinking water andsewage as well as other liquids compatible with the com-ponents of the products. Float switch Series IGM isspray- and dust proof thanks to a double sealing obtainedby injection moulding using the same material of con-struction for the body (non toxic polypropylene).

The IGM Series has been especially designed with verycompact size, although still retaining electrical and floatcharacteristics such as to ensure perfect operation.Product reliability is ensured thanks to the sound expe-rience of WATTS Cazzaniga in the sector as well as to thestringent testing programme to which both the processand product are submitted.

APPLICATION

It is important to make sure that they are no objectsimpeding the float movement. If necessary, adjust thefloat arm by suitably positioning it with relativecounterweight. It is good practice to position the float onthe side opposite to liquid inlet.

Electrical connection:

The three-pole cable (cable colour: Blue - Brown - Black)allows float switch Series IGM to be used for emptying orfilling depending on the electrical connections as descri-bed below:

- Emptying / Black - Brown connection / contact closes with float at top

- Filling / Black - Brown connection / contact closes with float at bottom

INSTALLATION AND ELECTRICALCONNECTIONS

Float switch Series IGM can be used either for filling oremptying tanks and wells.The important factor is the length of the rotating armwhich determines the minimum and maximum liquidlevels. For such purpose, the arm length can be shortenedusing the appropriate counterweight (CP/NSD). Thanks toits compact size, the float switch is suitable for connectionto pumps with cable lengths also shorter than 40 cm (therotating arm can be shortened up to 10 cm) Fig.1 and 2illustrate the operation.

OPERATION

Fig. 1

Fig. 2


EMPTYING

ONP

OFF

ON

OFF

Setting of FLU is by means of relative screw; fully tighten the screw to obtainminimum flow rate setting, fully loosen the screw to have maximum flow ratesetting. The following table gives the values for limiting flow rate settings in m3/hin relation to the pipe diameter. The FLU flow switch is supplied with the settingscrew fully tightened (minimum setting).

For applications in heating systems subject to I.S.P.E.S.L. approval in accordancewith the requirements of Body R, where a safety action is requested (switching offof the motor-driven pump under an abnormal condition), it is advisable to leavethe setting at minimum, bearing in mind that the device acts on the burner whenthe flow rate drops below the value given in the bold-face column.

FLUFlow switch for liquids, forpiping from 1" to 8". 0401125 1” IP64

0401126 1” IP67

Part No. Size ProtectionFLU is a flow switch which interrupts the electric controlcircuit of the burner when there is insufficient watercirculation in the boiler circuit owing to some abnormalcondition (e.g. stopping of the motor -driven pump). The FLU flow switch is operated thanks to an electricalblade-type tripping device (stainless steel blade) and canbe installed on pipework from 1" to 8" in size.

APPLICATION AND OPERATION

Mount so that the direction indicated by the arrowcoincides with the flow.For correct operation it is advisable:

- to mount on the return pipe

- to mount on horizontal pipe (mounting on vertical pipingis possible after appropriate setting)

- to keep a certain distance from sources of turbulence(elbows, valves, etc.); recommended min. distance isequal to 5 times the pipe diameter

- to keep a minimum distance of 55 mm between thepipework and the lower base of the appliance.

INSTALLATION

The 1-2 contact is normally open (closes when the flowrate setting is reached); contact 1-3 is normally closed(opens when the flow rate setting is reached). Earth con-nection is through relative screw located at the bottom onthe microswitch support.

ELECTRICAL CONNECTIONS

Conformity with Body R of I.S.P.E.S.L. regulationsCE mark in conformity with European Directives EEC89/336, EEC 73/23.

APPROVALS

ADJUSTMENT OF FLOW RATE SETTING

1” 34 0,9 0,4 2,0 1,51” 1/4 34 1,2 0,6 2,6 1,91” 1/2 57 1,6 0,9 3,3 2,6

2” 57 3,2 2,3 7,1 5,12” 1/2 88 4,2 3,5 8,0 7,0

3” 88 6,3 5,7 12,0 10,54” 88 13,5 12,0 28,0 26,04” 167 8,0 7,1 20,0 18,05” 88 27,0 23,0 60,0 58,05” 167 12,1 9,0 30,0, 28,06” 88 43,0 36,0 91,0 37,06” 167 17,2 12,0 35,0 32,08” 88 85,0 73,0 176,0 170,08” 167 42,0 36,0 90,0 85,0

Overall dimensions (mm) DESIGN FEATURES

Casing and cover Die-cast aluminium

Bellows Phosphor bronze

Blade Stainless steel (*)

Fitting Brass, 1" M

(*) Blade length varies according to the pipe diameter (see table)


Contact load rating 6 (2) A at 250 V ~ at 50 Hz

Max. fluid pressure 10 bar


Max. room temperature 60°C

Degree of protection IP 64 for Art. 0401125

IP67 for Art. 0401126

(*) also available in the version with microswitch 20 (8) A at 250 V ~.

NORMALLY OPEN NORMALLY

CLOSED

Pipe Blade Flow rate with Flow rate withdiameter length minimum setting maximum setting

(screw fully tightened) (screw fully loosened) inches mm m3/h m3/h

close open close open

The following table gives, for the various pipe diameters, the relative blade lengthsto be adopted and relative min. and max. load capacities for reversing the contact.The values given refer to horizontal installations.

B* - C* - D* = cut bladesThe drawings shows the traces to be followed for cutting the blades in order toobtain lengths suitable for the various pipes.

FS25Flow switch for liquids, forpiping from 1" to 6". Can be used in moistenvironments.

1505825 1” IP55

Part No. Size ProtectionThe FS25 series refers to a flow switch which interruptsthe electric control circuit of the burner when there isinsufficient water circulation in the boiler circuit owing tosome abnormal condition (e.g. stopping of the motor-dri-ven pump). The FS25 series flow switch is operatedthanks to an electrical blade-type tripping device (stain-less steel blade) and can be installed on pipework from 1"to 6" in size.


Mount so that the direction indicated by the arrowcoincides with the flow.For correct operation it is advisable:

- to mount on the return pipe

- to mount on horizontal pipe (mounting on vertical pipingis possible after appropriate setting)

- to keep a certain distance from sources of turbulence (elbows, valves, etc.); recommended min. distance is equal to 5 times the pipe diameter

- to keep a minimum distance of 55 mm between the pipework and the lower base of the appliance.

INSTALLATION

The 1-2 contact is normally open (closes when the flow rate setting is reached);contact 1-3 is normally closed (opens when the flow rate setting is reached). Earthconnection is through relative screw located at the bottom on the microswitchsupport.


UL/CSA approval.CE mark in conformity with European Directives EEC89/336, EEC 73/23.

APPROVALS

ADJUSTMENT OF FLOW RATE SETTING


1” 28,5 A 1,2 0,5 2,6 1,91”1/4 41 A + B* 1,8 0,8 4,0 3,31”1/2 44 A + B* 2,3 1,2 4,0 3,42” 54 A + B 3,0 1,8 7,8 6,6

2”1/2 70 A + B + C* 4,8 2,3 12,2 10,83” 82,5 A + B + C 6,8 2,7 11,8 10,54” 108 D* 8,9 4,3 16,7 14,55” 133 D* 13,2 6,6 26,1 20,96” 159 D 17,9 9,0 37,7 27,9

DESIGN FEATURES

Casing and cover Die-cast aluminium

Blade Stainless steel

Bellows Phosphor bronze

Fitting Brass, 1" M

Cable entry fitting 1/2" NPTF


Contact load rating 20 (8) A at 250 V ~

Max. fluid pressure 10 bar


Degree of protection IP 55

A

1”

28,5

44 41

54

70

82,5

133

108

159

3” 4” 5” 6”2”1”1/4 1”1/2 2”1/2

B C D

NORMALLYOPEN NORMALLY

CLOSED

Tube Blade Blade Flow rate with Flow rate withdiameter length combination minimum setting minimum setting

(screw fully tightened) (screw fully loosened)(inches) mm m3/h m3/h

contact contact contact contact close re-open close re-open

PRMPressure switch withmanual setting for heatingsystems.

0402101 1/4”F 3

Part No. Size barPressure switch Series PRM is a switch with normallyclosed contact; when the pressure of the system exceedsthe set pressure, the contacts are opened, thus interrup-ting the circuit. Closing of the contacts (resetting of thepressure switch) should be performed manually by pres-sing the reset button.


To adjust the cut-off pressure, turn adjusting nut (2). Theset value can be read on relative scale (1). To reactivatethe system after making the adjustment, wait for thepressure to drop at least 0.4 bar below set pressure, thenpress the reset button at the bottom of the pressureswitch.

ADJUSTMENT OF SET PRESSURE

Contact (b) - (c) is normally closed (it opens when the setpressure is reached). Connection to earth is via terminal(a). View of the terminal board from above after removingthe cover:


Approved in conformity with Body R (June 1982 edition) issued by I.S.P.E.S.L. CE mark in conformity with European Directives EEC 89/336, EEC 73/23.

APPROVALS


a

b c

2

(a) earth terminals(b) line terminals(c) motor terminals

DESIGN FEATURES

Connection 1/4" F

Inner cable gland diameter 11.5 mm max. (for cables H07RN-F-3X1)

Lever mechanism galvanized steel

Electrical contacts brass faced with Ag-CdO

Diaphragm NBR rubber with fabric core

Cover high impact ABS


Contact load rating 16 (10) A at 250 V ~

Rated voltage 250 V ~

Pressure setting range 1 ÷ 5 bar

Factory setting 3 bar

Max. fluid temperature 90 °C

Degree of protection IP 40

PA5Pressure switch forpumps and autoclaveswith adjustment rangefrom 1 to 5 bar.

0402202 1/4” 250V single phase0402105 1/4” 500V three phase

Part No. Size Power

PA12Pressure switch forpumps and autoclaveswith adjustment rangefrom 2 to 12 bar.

0402206 1/4” 250V single phase0402205 1/4” 500V three phase

Part No. Size Power

The pressure switch automatically controls operation ofthe motor-driven pump according to given set pressures.When the minimum set pressure is reached, the contactsare closed, therefore the motor is started. Reaching of themax. set pressure determines, instead, the opening of thecontacts, hence the motor is stopped.


Fully loosen differential adjusting nut (1). Turn range adju-sting nut (2) until obtaining the required closing valve forthe contacts. Tighten differential adjusting nut (1) until therequired cut-off pressure is obtained.

ADJUSTMENT OF SET PRESSURE

Contact (b) - (c) is normally closed (it opens when theset pressure is reached). Connection to earth is viaterminal (a).View of the terminal board from above after removing thecover:


Product PA5, 250 V:- conforms with European Standard EN 61058-1- is approved by VDE, SETI, SEMKO, DEMKO, NEMKO, CSA.

Product PA12, 250 V:- is NEMKO approved

CE mark in conformity with European Directives EEC 89/336, EEC 73/23.

APPROVALS


a

b c

2

(a) earth terminals(b) line terminals(c) motor terminals

DESIGN FEATURES

Connection 1/4" F

Inner cable gland diameter 11.5 mm max. (for cables H07RN-F-3X1)

Lever mechanism galvanized steel

Electrical contacts brass faced with Ag-CdO

Diaphragm NBR rubber with fabric core

Cover high impact ABS


Model PA5 PA12

Contact load rating 16(10)A 16(10)A a 250 V ~ a 250 V ~

Pressure setting range 1 ÷ 5 bar 2 ÷ 12 bar

Minimum differential 0,5 bar 1,5 bar

Maximum differential 2,5 bar 4 bar

Factory setting (closing) 1,4 bar 5 bar

Factory setting (opening) 2,8 bar 7 bar

Max. fluid temperature 90°C 90°C

Degree of protection IP 44 IP 44




1- IG

D-I

GM

- G

B -

01/

’02

PRESSURE REDUCING VALVES

01E051-GB

MAIN FEATURES

The pressure reducing valve is able,by varying its pressure drops, tohold the downstream pressure ofthe fluid at a constant level againstchanges in the upstream pressureand flow rate. The pressure redu-cing valve is used:

- in water/plumbing systems: to hold a constant water pressu-re in the water supply main afterthe pressure reducing valve;

- in plumbing systems/sanitary appliances: to maintain the water pressure constantly below the max. permissible value;

- in water/plumbing systems: to save water. By controlling thepressure to the taps, excessive withdrawal of water from thetaps is avoided;

- in compressed air systems: to keep the air pressure constant in the main, regardless of fluctuations in pressure supplied bythe compressors;

- after tanks or storage cylinders: to reduce and stabilize the pressure in the main, which is normally lower.

DRVDiaphragm pressure reducingvalve with single balancedseat. Ensures min. pressuredrops with high flow rates.Downstream pressure set bymeans of the setting screw(4) and is locked with locknut (3)

0501115 1/2”MM0501120 3/4”MM0501125 1”MM0501132 1.1/4”MM0501140 1.1/2”MM0501150 2”MM

Part No. SIZE

DRVMLike DRV, but with pressuregauge Ø50 for reading downstream pressure

0501315 1/2”MM0501320 3/4”MM0501325 1”MM0501332 1.1/4”MM0501340 1.1/2”MM0501350 2”MM

Part No. SIZE

The WATTS Cazzaniga pressure reducing valves SeriesDRV, DRVN and DRVD are of balanced seat type.This means that the inlet pressure, when acting on the twoopenings A and B with the same section, is compensated.Therefore it does not exert any force on the pin-plugsystem when the degree of valve opening changes.Instead, the outlet pressure acts on the diaphragm andhence on the pin-plug system which, therefore, is subjec-ted to two opposing forces, namely: the force exerted bythe outlet pressure tending to close the plug, and thepressure exerted by the spring tending to open it.This results in the pressure reducing valve acting like abalanced seat type having the outlet pressure almostunaffected by variations in upstream pressure.

GENERAL

The difference between the downstream pressure P2measured with zero flow rate and the same pressuremeasured with a general flow rate Q represents thepressure drop DP across the pressure reducing valve. Itdepends on the flow rate as shown in the pressure dropdiagrams.

If it is required for the upstream pressure not to exceed agiven value P2, this should be adjusted to value P2 whenthe flow rate is zero. At flow rate Q, the downstreampressure will be below the value P2 by an amount equal topressure drops DP.When the pressure reducing valve is installed to ensurethat the downstream pressure reaches a given value P2 ata certain flow rate Q, this pressure should be adjusted tovalue P2 + DP when the flow rate is zero. At flow rate Qthe downstream pressure will be equal to P2.

SETTING

The valve selection criterion consists in determining thediameter so that the speed of the fluid does not reachexcessive levels, at nominal flow rate, thus causing exces-sive pressure drops and noisy effluent which are tran-smitted to the supply main. The flow rate-speed diagramsprovide a guide for selecting the valve diameter in the caseof liquids (see water) or gases with pressures of 8 to 10bar (see air).

SIZING

Example 1 (cavitation)Pressure reducing valve with:Inlet pressure P1 = 14 barOutlet pressure P2 = 3 barFrom the cavitation diagram it can be seen that thepressure reducing valve works constantly in the red zone. To avoid rapid deterioration, two valves can be used, oneconnected upstream to the other.Upstream valve: pressure change from 14 to 6 bar(green zone)Downstream valve: pressure change from 6 to 3 bar(green zone).

Example 2 (flow rate)Pressure reducing valve DRV/N with:Inlet pressure (min.) P1 = 8 barOutlet pressure P2 = 4 barMax. flow rate Q = 50 l/min

From the flow rate-speed diagram it can be seen that adiameter of 20 or 25 can be used. The pressure dropdiagram shows that in the two cases:DRV20/N Q = 50 l/min DP = 1.1 barDRV25/N Q = 50 l/min DP = 0.68 bar

EXAMPLES OF SIZING

Flow rate/speed diagram DRV - DRVN

Flow rate

Sp

eed

(m

/s)

DN15

30

20

10

8

1

0,6

0,4

0,2

0,10,1 0,2 0,4 0,6 0,8 2 4 6 10 20 60 200 10001 8 40 100 400 600

10 50 100 1000 100005 500 5000

6

4

2

0,8

Water

Air

m3/h

l/min

DN20

DN25

DN32

DN40

DN50

Flow rate

Sp

eed

(m

/s)

DN65

6

4

1

0,6

0,4

0,2

0,1

4 6 10 20 60 200 10008 40 100 400 600

3 4 5 3001 100

2

0,8

m3/h

l/s

DN80

DN10

0

DN12

5

DN15

0

DN50

DN20

0

2 6 8 10 20 30 40 40 200

Flow rate/speed diagram DRVD

The cavitation diagram shows three zones of valveoperation in relation to the upstream and downstreampressures, namely:zone C: normal duty, no cavitationzone B: medium duty, possible cavitationzone A: heavy duty, the valve cavitates.Continuous operation in the red cavitation zone causesrapid deterioration of the internal parts. If the pressurereducing valve is to be used in the red zone, pleasecontact the WATTS Cazzaniga Engineering Department.

CAVITATION

Water, air and neutral (non aggressive) gases.

APPLICATION

- DVGW approval (Arbeitsblatt W 375)- LGA approval (DVR15 to 32) according to DIN 4109

class I (noise below 20 dB)- SVGW approval (W/TPW101).- TIN approval (Poland)- CSTB approval (NF P 43-006) (DRV15, DRV20).- KTW certification for all materials in contact with water.

APPROVALS

Cavitation diagram

Flow rate - Pressure drop diagram

Flow rate

0,08

0,1

0,2

0,3

2

0,6

0,4

Pre

ssu

re d

rop

[ bar ]

[l/m]

0,8

1

1 2 43 5 6 8 20 3010 40 60 80 100 200 400

DRV50/N DRV40/N DRV32/N DRV25/N DRV20/N DRV15/N


20

A Cavitation zone B Transition zone C Work zone

18

16

14

12

10

8

6

4

2

00 1 2 3

(bar)

(bar

)

Downstream pressure

Inle

t pre

ssur

e

4 5 6 7

A

B

C

DESIGN FEATURES

Body Shot-blasted brass OT58

Cap Shot-blasted brass OT58

Plug Brass OT58

Inlet / outlet connections Brass OT58

Diaphragm NBR with nylon fabric

Seal and O-ring NBR

Spring Galvanized steel

Setting screw and lock nut Brass OT58

Filters Stainless steel


Max. upstream pressure 25 bar

Downstream pressure (outlet) 1.5 to 6 bar

Connections to M / M tailpiece

Downstream pressure adjustment (screw 4) Clockwise rotation: increase in pressureAnti-clockwise pressure: decrease in pressure

Downstream pressure gauge (DRV-M only) Pressure gauge Ø50, scale 0 to 6 bar

Max. operating temperature 70° C

DRV / DRVM

SIZE1/2” 3/4” 1”

1.1/4” 1.1/2”

2”

L97110120140160175

L1152171191211246261

H135155182227255262

H1485866758288

Key:

1. Body2. Cap3. Lock nut4. Setting screw5. Spring6. Diaphragm7. Inlet connection8. Pin9. Plug

10. Guide bushing11. Filters12. Outlet connection

3

2

112

11

109

8

654

7

DRVNDiaphragm pressure reducingvalve with single balancedseat. Ensures min. pressuredrops with high flow rates.Downstream pressure set bymeans of knob (3) withadjustment scale 1 to 6 bar.

0502515 1/2”MM0502520 3/4”MM0502525 1”MM0502532 1.1/4”MM0502540 1.1/2”MM0502550 2”MM

Part No. SIZE

DRVMNLike DRVN, but with pressuregauge Ø50 for reading down-stream pressure.

0502615 1/2”MM0502620 3/4”MM0502625 1”MM0502632 1.1/4”MM0502640 1.1/2”MM0502650 2”MM

Part No. SIZE


APPLICATION

- DVGW approval (Arbeitsblatt W 375) - LGA approval (DRV15/N to DRV32/N) according to DIN

4109 class I (noise below 20 dB)- CSTB approval (NF P 43-006) (DRV15/N, DRV20/N).- KTW certification for all materials in contact with water

APPROVALS


0,08

0,1

0,2

0,3

2

0,6

0,4

Pre

ssu

re d

rop

Flow rate

[ bar ]

[l/m]

0,8

1

1 2 43 5 6 8 20 3010 40 60 80 100 200 400

DRV50/N DRV40/N DRV32/N DRV25/N

DRV20/N DRV15/N


DRVN / DRVMN

SIZE1/2” 3/4” 1”

1.1/4” 1.1/2”

2”

L97110120140160175

L1152171191211246261

H135155182227255262

H1485866758288

DESIGN FEATURES

Body Shot-blasted brass OT58

Cap Reinforced plastic

Plug Brass OT58

Inlet / outlet connections Brass OT58

Diaphragm NBR with nylon fabric

Seal and O-ring NBR


Setting screw Brass OT58




Downstream pressure (outlet) 1.5 to 6 bar

Connections to M / M tailpiece

Downstream pressure adjustment (knob 3) Clockwise rotation: increase in pressureAnti-clockwise pressure: decrease in pressure

Downstream pressure gauge (DRV-M/N only) Pressure gauge Ø 50, scale 0 to 6 bar


Key:

1. Body2. Cap3. Adjusting knob4. Setting screw5. Spring6. Diaphragm7. Inlet connection8. Pin9. Plug

10. Filters11. Outlet connection

1

10

11

2

3

4

5

6

8

9

7

U5B(WATTS Patent, U.S. PatentN° 3. 115. 154)Diaphragm pressure reducing valve,single seated, with spring. Ensuresmin. pressure drops with high flowrates. Provided with upstream filterhaving ample surface and separateconnection for easy cleaning.Downstream pressure set by meansof screw (3). Fitted with by-passvalve, it allows freeing on theupstream main any overpressure atdownstream side (generated, forexample, by expansion of water inthe water heaters).

1506115 1/2”FF1506120 3/4”FF1506125 1”FF1506132 1.1/4”FF1506140 1.1/2”FF1506150 2”FF

Part No. SIZEWater, air and neutral (non aggressive) gases.

APPLICATION

- ASSE, ANSI, CSA, UPC (USA) approvals- WATTS Patent, U.S. Patent N° 3. 115. 154

APPROVALS


0,1

2

1

0,8

1000 2000 4.000 6.000 10000 20000 40000

Pre

ssu

re d

rop

Flow rate

[ bar ]

0,6

0,4

0,3

0,2

0,08

0,06

0,04

0,03

DN50

DN40

DN32

DN25 DN

20

DN

15

[ l/h ]


U5B

WATTS Patent, U.S. Patent N° 3. 115. 154

SIZE1/2” 3/4” 1”

1.1/4” 1.1/2”

2”

L146162171203241279

H175184203213248311

H1484851577683

BY-PASS

UPSTREAMPRESSURE

EXPANSION

PLUG

REDUCEDPRESSURE

4

5

146

10 11 12 13

198

7

2

3 Key:

1. Body2. Cap3. Setting screw4. Lock nut 5. Spring6. Inlet connection7. Diaphragm8. Valve seat9. Outlet connection

10. Filter11. Filter cap12. Plug13. Guide bushing14. By-pass



Downstream pressure (outlet) Adjustable 1.5 to 5 bar

Upstream connection to F threaded tailpiece

Downstream connection F threaded

Downstream pressure adjustment (screw 3) Clockwise rotation: increase in pressure Anti-clockwise pressure: decrease in pressure


DESIGN FEATURES

Body Bronze

Cap Cast iron

Plug Stainless steel

Inlet connection Bronze

Diaphragm Nordel with nylon fabric

Seal and O-ring NBR


Setting screw and lock nut Galvanized steel


DRVD16Flanged pressurereducing valve withsingle balanced seatand spring. Ensuresmin. pressure dropswith high flow rates.Downstream pressureset by means of screw(9). Nodular cast ironbody faced with epoxyresins.

DRVD25Like DRVD16 but withmax. inlet pressure:25 bar.

DRVD40Like DRVD16 butwith max. inletpressure: 40 bar.


APPLICATION

PN: 16 barPout: 1.5-6 bar0504053 DRVD50/16 2" DN500504068 DRVD65/16 2"1/2 DN650504083 DRVD80/16 3" DN800504103 DRVD100/16 4" DN1000504128 DRVD125/16 5" DN1250504153 DRVD150/16 6" DN1500504203 DRVD200/16 8" DN200

Pout: 2-8 bar0504054 DRVD50/16/2-8 2" DN500504069 DRVD65/16/2-8 2"1/2 DN650504084 DRVD80/16/2-8 3" DN800504104 DRVD100/16/2-8 4" DN1000504129 DRVD125/16/2-8 5" DN1250504154 DRVD150/16/2-8 6" DN1500504204 DRVD200/16/2-8 8" DN200


PN: 40 barPout: 1.5-6 bar0504056 DRVD50/40 2" DN500504071 DRVD65/40 2"1/2 DN650504086 DRVD80/40 3" DN800504106 DRVD100/40 4" DN1000504131 DRVD125/40 5" DN1250504156 DRVD150/40 6" DN150

Pout: 2-8 bar0504057 DRVD50/40/2-8 2" DN500504072 DRVD65/40/2-8 2"1/2 DN650504087 DRVD80/40/2-8 3" DN800504107 DRVD100/40/2-8 4" DN1000504132 DRVD125/40/2-8 5" DN1250504157 DRVD150/40/2-8 6" DN150

Pout: 4-12 bar0504058 DRVD50/40/4-12 2" DN500504073 DRVD65/40/4-12 2"1/2 DN650504088 DRVD80/40/4-12 3" DN800504108 DRVD100/40/4-12 4" DN1000504133 DRVD125/40/4-12 5" DN1250504158 DRVD150/40/4-12 6" DN150

PN: 25 barPout: 1.5-6 bar0504050 DRVD50/25 2" DN500504065 DRVD65/25 2"1/2 DN650504080 DRVD80/25 3" DN800504100 DRVD100/25 4" DN1000504125 DRVD125/25 5" DN1250504150 DRVD150/25 6" DN1500504200 DRVD200/25 8" DN200




Max. upstream pressure 16 - 25 - 40 bar (ND200 only up to 25 bar)

Downstream pressure (outlet) 1.5 to 6 bar (standard)2 to 8 bar (optional)4 to 12 bar (optional)

Downstream pressure adjustment Clockwise rotation: increase in pressureAnti-clockwise pressure: decrease in pressure

Connections Flanged according to UNI2223 (NP16 - 25 - 40)ND200 only NP16 and NP25

Pressure gauge connections G 1/4 " ND50 to ND65(upstream and downstream) G 3/8" ND80 to ND200


DESIGN FEATURES

Body Nodular cast ironGS400-15

Cap Nodular cast ironGS400-15

Plug (ND 50 to 100) Brass(ND 125 to 200) Galvanized steel

Seal NBR

Lip seal NBR

Seal ring Bronze

Guide bushings Bronze

Spring Faced steel

Setting screw and lock nut Galvanized steel

Finish Epoxy resins (blue RAL 5017)


0,1

Pre

ssu

re d

rop

Flow rate

[ bar]

0,2

0,3

0,4

0,6

0,8

1

1,5

50 60 80 100 200 300 400 600 800 1000 2000 3000 5000 [ l/min]

DN200 DN150 DN125 DN100 DN80

DN65 DN50


DRVD

Key:

1. Body2. Cap3. Plug4. Seal5. Spring6. Seal ring7. Guide bushings8. Lip seal9. Setting screw

10. Cap screws

9

2

5

10

8

7

36

4

1

SIZE506580

100125150200

L230290310350400450550

H3834404905617128391684

H18390100121152169234

B PN16165185200220250285340

B PN25165185200235270300360

B PN40165185200235270300--




1- D

RV-

DR

VM

- G

B -

01/

’02

WACOPUMPELECTRONIC MULTI-PURPOSEUNIT FOR CONTROLLING ANDPROTECTING ELECTRICALLY

DRIVEN PUMPS

01E151-GB

- Energy saving- Saving in installation space- Protection of the electrically-driven pump against water

supply failure- Display of system performance (pressure reading via

pressure gauge)

The unit allows:- Elimination of: pressure switch,

5-way pipe fitting, float, probes, safety flow switch, expansion vessel

- Labour saving- Easy installation- Reduction of pump start/stops

The great advantage of WACOPUMP: all the pump control and protection functionsare combined in just the single unit !

0

2

46

8

10

12barpsi




1- W

AP

-WA

PR

-GB

-

01/’

02


Max. water temperature 60°C

Max. pressure 10° bar

Max. flow rate 6.9 m3/h (115 l/min)

Pump restarting pressure 1.5 bar

Contact load rating 10A - 240V - 50/60Hz

Protection class IP54

Pressure gauge 0 to 10 bar

DESIGN FEATURES

Body plastic

Diaphragm natural rubber

Spring tropicalized steel

Seals nitrile

Pump connection 1" M, outlet 1" F

Reset push button for manual start

POWER led power on

PUMP led pump running


WAP WAPR

WAPWACOPUMP.Multi-purpose electronicunit for controlling andprotecting electrically-driven pumps

0605126 1”MF 6,9

Part No. Size Kvs

WAPRWACOPUMP.Like WAP, but withprovision for adjusting pump restarting pressure from 1.5 to 3 bar.

0605226 1”MF 6,9

Part No. Size Kvs

The multi-purpose electronic units Series WAP - WAPRare designed for controlling and protecting electrically-driven pumps in plumbing installations or systems forthe garden, irrigation, sports, or water reclaiming.Features:- constant pump operation by avoiding continuous

starts/stops of the pump- pump start commanded with a minimum difference in

water pressure (opening of a tap)- after using the water (tap closed), the pump is

switched off automatically- pump protection against water supply failure:

pump stops after 8 seconds of operation- system protected against risk of water hammer- pressure gauge for easy reading of water pressure- built-in check valve.

INSTALLATIONPrime the pump correctly before proceeding to connectthe water supply.Install WACOPUMP in vertical position by connecting the1" M threaded inlet to the pump outlet and the 1" Fthreaded outlet to the water main. Do not install check valves at the outlet.The following accessories are recommended but notindispensable:

- hose with removable fitting for connection to the water main so as to protect the unit from any stress or vibrations

- ball valve for shutting off the pump unit from the water main.

APPROVALSCE mark in accordance with Directives EEC 89/336,EEC 73/23.

APPLICATION

FAN COIL VALVES SERIES 2131 - 3131 - 4131

MAIN FEATURES

- Available in the following versions :

• 2 way, Size : 1/2” - 3/4” - 1”• 3 way, Size : 1/2” - 3/4” - 1”• 3 way 4 ports, Size : 1/2” - 3/4”

- Compact sizes and reduced weights.

- Conforms to Italian Law UNI 8156/81.

01F151-GB

213112 1/2" MM 200213134 3/4" MM 20021311 1" MM 500

2131Two-way brass valvefor fan-coils. ON/OFF operation withactuators Series 10C, 20Cand 20CI.

Part No. Size Weight(g)

313112 1/2" MM 200313134 3/4" MM 25031311 1" MM 550

3131Three-way brass valvefor fan-coils.ON/OFF operation withactuators Series 10C, 20Cand 20CI.


413112 1/2" MM 350413134 3/4" MM 450

4131Three-way brass valvewith 4 connections forfan-coils. ON/OFF opera-tion with actuators Series10C, 20C and 20CI.


8401212GAS 1/2" x 1/2" 508403434GAS 3/4" x 3/4" 10084011GAS 1" x 1" 100

840Soft sealed union withnut for zone valves series 2131, 3131, 4131.


Operation of the fan-coil control valves Series 2131,3131, 4131 is through the automatic movement of theplug which shut-offs the heat-transfer fluid: the ON/OFFaction of the plug is controlled by a wax thermostatic ele-ment located inside the actuators Series 10C and 20Cactivated by a PTC thermistor against a signal sent by aroom thermostat (or timing thermostat).

The electrothermic actuator series 10C, in the 4-wireversion, is provided with an auxiliary contact for additio-nal controls (metering, control of pumps, fans or otherequipment).

The mechanical operation of the valves is of NO type.When coupled to the actuator, under rest conditions(actuator not energized), the valve can be:

• Normally closed (NC) (closed, straight way and by-pass open if 3-way)

• Normally open (NO) (open, straight way and by-pass closed if 3-way)

The hydraulic flow rate and pressure drop characteristicsof the valves are given in appropriate charts; when theyare coupled with the ON/OFF actuators, they assume thecharacteristics associated with such device.

OPERATION

The control valves for fan-coils, Series 2131, 3131, 4131,are normally used for controlling flows of hot and coldwater in heating and/or air conditioning systems, throughan electric ON/OFF command.The valves, made of brass, are offered in the male threadconfiguration and in the following versions:

• 2-way series 2131 • 3-way series 3131• 3-way 4 ports series 4131 with built-in by-pass.

They can be actuated by electrothermic actuators withON/OFF action:

- Series 10C, available in the following versions

• NO (normally open)• NC (normally closed)2-wire (Standard) or 4-wire (with auxiliary contact)

- Series 20C, available in the following version

• 2-wire, NC (normally closed)both easily to fix to the valve body through a threadedring nut.

DESCRIPTION

The valves are used for shutting off (Series 2131,2-way)or diverting/mixing (Series 3131 - 4131, 3-way -3-way 4 ports size 1/2” and 3/4”), or diverting (Item 313113-way size 1”) the heat transfer fluid to a heating or airconditioning system as required by the room thermostat(or timing thermostat).Thanks to the very compact size, the control valvesSeries 2131,3131,4131 are suitable for installation onbanks of single terminal units (fan-coils, ventilating units).

APPLICATION

The 2-way fan-coilvalves series 2131serve for shuttingoff the flow of heattransfer fluid.

SHUT-OFF

Thanks to the specialconfiguration of theplug controlling theby-pass flow, the3-way fan-coil valvesseries 3131 or 3 waywith 4 ports series4131, can be usedequally as well asdiverting or mixervalves (thus optimi-zing the variousplumbing installationrequirements).Apart from valvesseries 31311 (1”)which are only usedfor diverting service.

DIVERTING

MIXING

The fan-coil control valves Series 3131, 4131, are desi-gned and built to be used both for diverting and mixingservice, provided the max. operating Dp given in the tablebe observed in order to avoid risk of faulty operation;except for valves Item 31311 (1”) where the recommen-ded application is solely that of diverting.

The reliability of the fan-coil control valves Series2131, 3131, 4131 is guaranteed by the 100% testing onthe production, which check the hydraulic seals of thevalve body and its external components and that of theplug in its flow shut-off function.

Choice of fan-coil control valves depends on the type ofplumbing systems as well as the required flow rate andpressure drop characteristics.

In systems with 2-way control valves it is advisable toprovide by-pass valves Series 466 to ensure a minimumrecirculation of the fluid.

It is recommended not to install the valve with theactuator facing down.

The valves can be connected by using the soft-sealtailpieces Series 840 with the range of single-piece orunion fittings (3-piece).

INSTALLATION


A

D D

B2131

DD

C B

A

ITEM A B CSIZE

4131A

D

D D

C

B

3131

Hydraulic Characteristics

213112

213134

21311

313112

313134

31311

413112

413134

1/2"

3/4"

1"

1/2"

3/4"

1"

1/2"

3/4"

1.7

2.8

5.2

1.7

2.5 (Mix)2.8 (Div)

5.2

1.7

2.5 (Mix)2.8 (Div)

---

---

---

1.2

1.6

3.3

1.2

1.8

0.8

0.7

0.6

0.7 (Mix)0.8 (Div)

0.5 (Mix)0.7 (Div)

0.6

0.7 (Mix)0.8 (Div)

0.5 (Mix)0.7 (Div)

Kvby-pass

Kvsstraight way

∆P maxOperating

barSizeItem

∆P close off with

10CNC/NA 20Cbar

2.5

1.5

0.8

2.5

1.5

0.8

2.5

1.5

Mix: Mixing Dev: Diverting

2131122131342131131311231313431311413112413134

1/2”3/4”1”

1/2”3/4”1”

1/2”3/4”

5256825256825256

4345705658938386

---

2534413550

SPECIFICATION

Max. pressure 16 bar

Min. fluid temperature 4 °C

Max. fluid temperature 110 °C

Liquids which can be used Water also with glycol ≤ 30%

Plug stroke 2.5 mm

By-pass leakage < 0,02 % Kvs

Actuator connection Threaded ring nut M 30 x 1.5

MATERIALS OF CONSTRUCTION

Body Brass CW617N

Rod Brass with chemical nickel-plating

Spring AISI 302

Plug EPDM

Size 3/4" 2131 - 3131 - 4131




1- 2

131-

3131

-413

1- G

B -

12/

’01

Pressure drop charts

Size 1/2" 2131 - 3131 - 4131

Size 1"2131 - 3131

FLOW RATE

[ kPa ]

0.01 0.02 0.03 0.05 0.1 0.2 0.3 0.5 1 2 3H

EA

D L

OS

S

[ l/h ]

[ m /h ]3

[ m bar ]

200

100

[ mm c.a. ]

2000

800

500

400

300

200

1000

50

30

20

100

10

20

8

5

4

3

2

10

0.8

0.5

0.3

0.2

1

0.1

20 30 50 10010 200 300 500 1000 2000 3000

80

50

40

30

20

5

3

2

10

1

by-pass Mix. Kv 1,6

Straight Way Div. Kv 2,8

by-pass Div. Kv 1,8

Straight Way Mix. Kv 2,5

FLOW RATE

[ kPa ]

0.01 0.02 0.03 0.05 0.1 0.2 0.3 0.5 1 2 3

HE

AD

LO

SS

[ l/h ]

[ m /h ]3

[ m bar ]

200

100

[ mm c.a. ]

2000

800

500

400

300

200

1000

50

30

20

100

10

20

8

5

4

3

2

10

0.8

0.5

0.3

0.2

1

0.1

20 30 50 10010 200 300 500 1000 2000 3000

80

50

40

30

20

5

3

2

10

1

by-pass Mix. Kv 1,2

Straight Way Div. + Mix. Kv 1,7

by-pass Div. Kv 1,3

FLOW RATE

[ kPa ]

0.01 0.02 0.03 0.05 0.1 0.2 0.3 0.5 1 2 3

HE

AD

LO

SS

[ l/h ]

[ m /h ]3

[ m bar ]

200

100

[ mm c.a. ]

2000

800

500

400

300

200

1000

50

30

20

100

10

20

8

5

4

3

2

10

0.8

0.5

0.3

0.2

1

0.1

20 30 50 10010 200 300 500 1000 2000 3000

80

50

40

30

20

5

3

2

10

1

by-pass Kv 3,3

Straight Way Kv 5,2

HYDRAULIC BACKFLOW PREVENTERS

01L101-GB

MAIN FEATURES

Backflow preventer with adjustablereduced pressure zone for protectionof the drinking water supply main.High protection series (air-in/air-outpatent) DIW909, size 3/4" to 10".Compact series DIW009 :size 1/2" to 3".

Why a backflow preventer is important for public health

The possibility of pollution of drinking waterpipelines is a risk not to be overlooked. Infact, public opinion is very much aware ofthe problem, especially after the increasedinformation and concern in the ecologicalfield, which has led legislators to graduallyadapt the Italian and international standards.In this connection considerable resourceshave been invested in technological researchand manufacture of a range of equipmentand accessories designed to prevent pollu-tion of the water in the distribution systems.

The Ministry of Health has issued regula-tions and acts providing local administra-tions and private individuals with preventiveand control measures against pollution ofdrinking water. There are two conditionswhich can give rise to a similar contamina-tion:

- contact between non-drinkable water anddrinking water

- risk of return of pollutants to the drinkingwater supply.

There are basically two cases where suchproblem arises:

- BACK SIPHONAGE: when the pressure inthe supply main is lower than the branch cir-cuit; for example, owing to a break in thepiping or interruption in the drinking watersupply.

- BACKFLOW: when in a non drinkable watercircuit, for example a heating system, apressure is supplied greater than the mainsupply system feeding it.

To overcome these difficulties, it is neces-sary to install a pressure vacuum breakertank or positive acting safety valve betweenthe circuit which could cause one of thesetwo problems and the supply system.

The first solution is expensive and also takesup much space; the second solution is morecost-effective and involves minimum spacerequirements. Hence this safety valve,known as backflow preventer, finds usefulapplication when installed at the inlet of thecircuit, in all potentially risky supply pipes inorder to prevent reverse in the direction offlow.

The backflow preventer has three distinctzones, namely: an inlet zone (upstreamzone), an intermediate zone (with reducedpressure) and an outlet zone (downstreamzone).

- diesel engine cooling circuits or cogenera-tion systems, fire fighting systems with sprinklers or nozzles (UNI)

- drinking water supply systems for boats, bottle washing systems

- metallurgical industry:

- cooling of tank containing chemicals

- coating systems

- pickling systems

- heat exchangers

- plastics industry:

- machine cooling

- industry in general:

- water treatment systems

- biochemical industries:

- research laboratories

- refineries:

- fire-fighting systems

- printing industries:

- cylinder washing water

- food industries:

- all applications for drinking waters mixed with other substances

- etc.

The backflow preventer has two independentcheck devices which separate the secondzone from the other two, and a normally-open drain device. Furthermore it is alsoable to control the differential pressurebetween the upstream and intermediatezones by activating the drain device whennecessary.

Thanks to all these characteristics the back-flow preventer is not equivalent to a non-return valve as the latter is not able, evenwith double seat, to ensure automaticdisconnection, therefore breaking the flow,but it only has a check function.

There are application sectors which, at worldlevel, are considered to be with high sanitaryrisk and in which, therefore the installationof adequate protection, such as a backflowpreventer, is essential, namely:

- independent or central heating systems

- dry cleaning machines for dry cleaner shops

- photographic treatments

- animal breeding (automatic dosing of water and medicinal substances)

- dental clinics (dental equipment)

- hospitals

protections for meters concerning:

- hygiene and preventive treatment laboratories

- official pathology departments

- isolation wards

- dialysis apparatus

- sterilization autoclaves

- etc.

- centralized cleaning systems (high pressure)

- public and private swimming pools

- demineralized water systems

- industrial washing machines

- hotels, restaurants and motorway snack bars (preparation of food, mixing of basicsyrups with high pressure carbonic acids,etc.)

- air handling systems

- cleaning systems for cars, aeroplanes, wagons, etc.

- automatic irrigation or watering systems,liable to sanitary risk owing to effect of additive substances, fertilizers, pesticides,etc.

WATTS Patentan exclusive design: air-in/water-out

If the supply pressure becomes negative(i.e. less than the atmospheric pressure), itis not possible to maintain a reducedpressure zone. The only system for protec-ting the water supply system in this caseconsists in allow air to enter these zones andbreak the vacuum. The air entering thereduced pressure zone allows draining thecontaminated water via the drain valve. The DIW909 Series are designed with twoports: one for the air inlet and the other fordraining water. When this drain valve is ope-ned, the opening of the air inlet port allowsair to enter, therefore it is possible to drainthe water.

OPERATIONBackflow preventer DIW909 consists of anupstream check valve, a downstream checkvalve, a central chamber (called "reducedpressure zone") provided with a drain valvewhich opens in the case of accidental condi-tions.

NORMAL OPERATION (FIG. 1)A) When operation starts, the water fills theupstream zone and exerts the pressure:

- on the upstream check valve (1) which is held closed by the spring

- on the diaphragm (3) part (I)thus compressing the spring and closing

plug (8 water-out) and plug (7 air-in)

B) During normal water flow:the thrust exerted by the water then opensthe two check valves (1) and (2).

FLOW STOP(STATIC PRESSURE) (FIG. 2)

A) The two check valves are closed and iso-late central reduced pressure zone (6).During normal operation the force exertedby the spring in upstream check valve (1)causes a pressure drop: this lowers thepressure in central zone (6) to below thepressure in the upstream zone.

B) The force exerted on part (I) of diaph-ragm (3) is greater than the force exerted onpart (II), therefore the drain valve remainsclosed.

ACCIDENTAL CONDITION: OVERPRESSUREDOWNSTREAM SIDE (FIG. 3)

A) When downstream check valve (2) has aperfect seal, there is no return of water, the-refore no pollution is possible.

B) If downstream valve (2) is without perfectseal, the contaminated water leaks into thecentral zone. Hence the pressure in this zonetends to increase and thrust against part (II)of diaphragm (3). As spring (5) acts in thesame direction, it causes plugs (8 water-out)and (7: air-in) to close, while the pressure inthe central zone is still lower than the pres-sure in the upstream zone. Therefore air canenter zone (6) via channel (4) this allowingquick draining of the water contained in zone(6). Hence the contaminated water collectedin the central zone is discharged outside.

ACCIDENTAL CONDITION: NEGATIVE PRESSURE UPSTREAM SIDE (FIG. 4)

A) If there is a drop in upstream pressure,the two check valves are closed immediately.The pressure exerted on part (I) of diaph-ragm (3) is insufficient to hold spring (5)compressed, therefore it opens plugs (8water-out) and (7 air-in). The air enters cen-tral zone (6) thus facilitating immediate drai-nage of the water.

B) If there is back siphonage, plugs (8) and(7) remain fully open already when theupstream pressure is still positive.

Fig.1

Fig.2

Fig.3

Fig.4

REDUCEDPRESSURE

ZONE

REDUCED PRESSURE

ZONE

WATEROUTLET

AIRINLET

WATEROUTLET

DRAINVALVE

AIRINLET

1 6

2

5

78part

(II)

part(I)

34

1 6

2

5

78part

(II)

part(I)

34

1 6

2

5

78part(II)

part(I)

34

1 6

2

5

78

part(II)

part(I)

34

SizesThreaded series from DIW909/20 to DIW909/50

Technical dataThreaded series from DIW909/20 to DIW909/50DESIGN FEATURES- Straightforward design, maintenance

not requiring special tooling

- Bronze body

- Stainless steel valve pins, springs

- Elastomeric drain valve diaphragm

Pressure control valve

- Bronze body

- Polished bronze ball

- Carbon fibre reinforced teflon seals

- Complete with inspection system and connection to discharge pipe of stainless steel.

TECHNICAL CHARACTERISTICS- Max. temperature 65° C

- Max. pressure 10 bar

- Male/male tailpiece connections

- Approvals:NF (F), KIWA (NL), SVGW (CH), USC (USA), UL (USA).

D

C

B

G

ø Ev

B

A

P

RE

SS

UR

E D

RO

P

FLOW RATES

[kPa]

100

[l/s]0

90

80

70

60

50

0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0

[l/h]0 1800 3600 5400 7200 9000 10800 12600 14400

P

RE

SS

UR

E D

RO

P

FLOW RATES

[kPa]

100

[l/s]0

90

80

70

60

50

0,3 0,6 0,9 1,2 1,5 1,8 2,1 2,4

[l/h]0 1080 2160 3240 4320 5400 6480 7560 8640

P

RE

SS

UR

E D

RO

P

FLOW RATES

[kPa]

100

[l/s]0

90

80

70

60

50

0,2 0,4 0,6 0,8 1,0 1,2 1,4 1,6

[l/h]0 720 1440 2160 2880 3600 4320 5040 5760

P

RE

SS

UR

E D

RO

P

FLOW RATES

[kPa]

100

[l/s]0

90

80

70

60

50

0,12 0,24 0,36 0,48 0,60 0,72 0,84 0,96

[l/h]0 432 864 1296 1728 2160 2592 3024 3456

P

RE

SS

UR

E D

RO

P

FLOW RATES

[kPa]

100

[l/s]0

90

80

70

60

50

00,8 0,16 0,24 0,32 0,40 0,48 0,56 0,64

[l/h]0 288 576 864 1152 1140 1728 2016 2304

DIW909/20 (3/4”)

DIW909/25 (1”)

DIW909/40 (1.1/2”)

DIW909/50 (2”)

DIW909/32 (1.1/4”)

FLOW RATE - PRESSURE DROP DIAGRAM

STEEL ELBOWS FOR VERTICALLY INSTALLED DRAIN SYSTEMS

SIZE3/4”1”

1.1/4”1.1/2”

2”

A221221295295295

B102102127127127

C119119168168168

D270270320320320

G2525373737

øEv63-7563-75

90-11090-11090-110

SIZE3/4” - 1”

1.1/4” - 1.1/2” - 2”

A60102

B60102

According to UNI 9157 standards

Size Flanged series from DIW909F/65 to DIW909F/250

Technical dataFlanged series from DIW909F/65 to DIW909F/250

H2

C

H1

A B

[kPa]

[l/s]0

90

80

70

60

50

20 40 60 80 100 120 140 160

[l/h]0 72000 144000216000288000360000 432000 504000 576000

P

RE

SS

UR

E D

RO

P

FLOW RATES

[kPa]

[l/s]0

90

80

70

60

50

12 24 36 48 60 72 84 96

[l/h]0 43200 86400 129600172800216000 259200 302400 345600

P

RE

SS

UR

E D

RO

P

FLOW RATES

P

RE

SS

UR

E D

RO

P

FLOW RATES

[kPa]

[l/s]0

90

80

70

60

50

7 14 21 28 35 42 49 56

[l/h]0 25200 50400 75600 100800126000 151200 176400 201600

[kPa]

[l/s]0

90

80

70

60

50

3 6 9 12 15 18 21 24

[l/h]0 10800 21600 32400 43200 54000 64800 75600 86400

P

RE

SS

UR

E D

RO

P

FLOW RATES

P

RE

SS

UR

E D

RO

P

FLOW RATES

[kPa]

[l/s]0

90

80

70

60

50

2 4 6 8 10 12 14 16

[l/h]0 7200 14400 21600 28800 36000 43200 50400 57600

P

RE

SS

UR

E D

RO

P

FLOW RATES

[kPa]

[l/s]0

90

80

70

60

50

1,2 1,4 3,6 4,8 6,0 7,2 8,4 9,6

[l/h]0 4320 8640 1296017280 21600 25920 30240 34560

DIW909/65 (2.1/2”)

DIW909/80 (3”)

DIW909/150 (6”)

DIW909/200 (8”)

DIW909/100 (4”) DIW909/250 (10”)

DESIGN FEATURES- Straightforward design, maintenance not

requiring special tooling

- Cast iron body and covers finished on the outside and inside with two coats of food-grade epoxy resin


- Bronze check valves

- Buna N check seals


- Bronze body


- Teflon seals

- Complete with inspection system and connection to discharge pipe of stainless steel for sizes 2" 1/2" - 3".

- Complete with inspectable discharge tundish for sizes from 4" to 10".

TECHNICAL CHARACTERISTICS - Max. temperature 65° C


- Flanged connections

- Approvals: NF (F), KIWA (NL), SVGW (CH), USC (USA), UL (USA).

FLOW RATE - PRESSURE DROP DIAGRAM

SIZE

6580

100150200250

A

102127152241267298

B

229229346346470470

C

664664940113014031715

H1

133133152152248248

H2

178178241368470546

WeghtKg.5151111211379565

N° of boltsThread

4 x M 168 x M 168 x M 168 x M 208 x M 2012 x M 20

Hole centre distance

145160180240298356

Holediameter

181818222222

According to UNI 9157 standards

The assembly arrangement to be adopted isthe one in fig. 1 which also gives the distan-ces to be observed between the piping.

EXTRACT UNI 9157INSTALLATION SITEThe choice of installation site for the equip-ment should be such that the entire backflowpreventer assembly be outside any floodablezone always taking into consideration thehighest level which could be reached by thewater in the adjacent place in the event offrequent flooding. Preferably the backflowpreventer should be installed outside theentire building work and above the ground.

When the unit is placed between a systemoffers risks of pollution for the drinkingwater supply main, all supply systems fee-ding the water for plumbing or food applica-tions should be arranged upstream of thebackflow preventer while the downstreamsupply main should have distinctive signsand conventional safety colours in accordan-ce with UNI 5634 P.

The space around the backflow preventershould be sufficient to allow trouble-freeinstallation or removal. It should allow easyaccess for repairs or tests for correct opera-tion.

Opening of the drain valve should be such asto allow evacuation by gravity of the waterflows. Piezometric connections should notbe located close to the resting surface whilethe operating devices should be placed onthe front face side.

The backflow preventer unit must be placedin an easily accessible, common part of thebuilding. It must be ventilated and must notbe floodable. The drain device must notcause toxic emissions in the room. The drai-ned waters should not be harmful for theenvironment: opinion of the health authori-ties must be sought for those cases coveredby current regulations. The leak recoveryunit placed under the drain spout and opera-tions for collecting the water to be drainedshould have a minimum size as according tothe following:

Size, backflow preventer Size drain system

The backflow preventer should be prece-ded by a filter and should be placedbetween two shut-off valves.

Assembly arrangement

METERS SUPPORTS

CEILING / VAULT / GIRDER

GROUND / FLOOR / GANGWAY

DRAINAGEOR

TUNNEL

DRAIN PIPE

DRINKINGWATERMAIN

SOME INSTALLATION EXAMPLES

15 20 25 32 40 50 65 8040 60 60 80 80 80 80 100

SPECIFICATION DATA FORBACKFLOW PREVENTERSSERIES DIW909, SIZE RANGE3/4" TO 2"Backflow preventer with regulated reduced

pressure zone and high protection, comple-

te with patented "air-in" "water-out" system

U.S. Patent N° 4.2.4.1.752.

DESIGN FEATURES

- Straightforward design, easy maintenan-

ce not requiring special tooling.

- Bronze body


- Elastomeric drain valve diaphragm.


- Bronze body



- Complete with inspection system

and connection to discharge pipe of

stainless steel.


- Max. temperature 65° C


- Male/male tailpiece connections

- Approvals:

NF (F), KIWA (NL), SVGW (CH), USC

(USA), UL (USA).

- Conforms with UNI 9157.

SPECIFICATION DATA FORBACKFLOW PREVENTERSSERIES DIW909, SIZE RANGE2 1/2" TO 10"Backflow preventer with regulated reduced

pressure zone and high protection, comple-

te with patented "air-in" "water-out" system

U.S. Patent N° 4.2.4.1.752.

DESIGN FEATURES

- Straightforward design, easy maintenan-

ce not requiring special tooling.

Specification dataDIW909Threaded backflow preventer, with regulated reducedpressure zone to UNI 9157 Standards.High protection series, WATTS patent "AIR IN - WATEROUT".Bronze body.Max. operating temperature 65° C.Max. pressure 10 bar.Male/male tailpiece connections.Complete with inspection system and connection todischarge pipe of stainless steel.Available on request backflow preventers with max. tem-perature 90° C.

UNI 9157 certification.

Conforms with NF, KIWA, USC, ANSEAU, ASSE, AWWA,IAPMO.

1505001 3/4" MM1505002 1" MM1505003 1.1/4" MM1505004 1.1/2" MM1505005 2" MM

Part No. Size

DIW909FFlanged backflow preventer, with regulated reduced pres-sure zone to UNI 9157 Standards.Highly protection series, WATTS patent "AIR IN -WATER OUT".Cast iron body finished on inside and outside with 2coats of epoxy resin.Stainless steel drain valve guides and springs.Max. operating temperature 65° CMax. pressure 10 barFlanged connections PN 10.Complete with inspection system and connection todischarge pipe of stainless steel for ND 65 and 80.Complete with discharge tundish from ND 100 to ND250.


Conforms with NF, KIWA, USC, ANSEAU, ASSE, AWWA IAPMO.

1505006 651505008 801505010 1001505015 1501505020 2001505025 250

Part No. Size

- Cast iron body and covers finished on the outside and inside with two coats of food-grade

epoxy resin


- Bronze check valves

- Buna N check seals


- Bronze body



- Complete with inspection system and connection to discharge pipe of stainless steel for

sizes 2.1/2" - 3"

- Complete with inspectable discharge tundish for sizes from 4" to 10"


- Max. temperature 65° C


- Flanged connections

- Approvals: NF (F), KIWA (NL), SVGW (CH), USC (USA), UL (USA).

- Conforms with UNI 9157.

OperationBackflow preventer 009 consists of anupstream check valve, a downstream checkvalve, a central chamber (called "reducedpressure zone") provided with a drain valvewhich opens in the case of accidental condi-tion.

A) When operation starts, the water fills theupstream zone and exerts the pressure:

- on the upstream check valve (1) which isheld closed by the spring

- on the diaphragm (4) which closes drainvalve (3) thus compressing spring (5)

B) During normal flow the thrust exerted bythe water opens the two check valves (1)and (2) in succession, and closes drain valve(3).

A) The two check valves are closed and iso-late the central reduced pressure zone .During normal operation the force exertedby the spring in upstream check valve (1)causes a pressure drop: this lowers thepressure in the central zone to below thepressure in the upstream zone.

B) The force exerted on the top part of diaph-ragm (4) is greater than the force exerted onthe bottom part, therefore the drain valveremains closed.

A) Downstream check valve (2) closes, if ithas a perfect seal, there is no return ofwater, therefore no pollution is possible.

B) If downstream valve (2) is without perfectseal, the contaminated water leaks into thecentral zone. Hence the pressure in this zonetends to increase and thrust against the toppart of diaphragm (4) thus causing the drainvalve to open. Spring (5) acts in the openingdirection of this valve which, therefore,starts to open when the pressure in the cen-tral zone is still lower than the pressure inthe upstream zone. Hence the contaminatedwater collected in the central zone isdischarged outside.

If there is a drop in upstream pressure, thetwo check valves are closed immediately.The pressure exerted on the top part ofdiaphragm (4) is insufficient to hold spring(5) compressed, therefore it opens the drainvalve.

Fig.1

Fig.2

Fig.3

Fig.4

Sizes and Pressure dropsDIW009/15

DIW009/20 - DIW009/25

NF (F), KIWA (NL), SVGW (CH), USC (USA)


L

H2

H2

P

P

RE

SS

UR

E D

RO

P

FLOW RATES

[bar]

1,6

0,8 1 1,8 3,4 3,8 [ m3/h]

1,4

1,2

1

0,8

0,6

0,4

0,2

03,63,232,82,62,42,221,61,41,20,60,40,20

G

L

H2

H1

P

ø Ev

P

RE

SS

UR

E D

RO

P

FLOW RATES

[bar]

2 [ m3/h]

1,41,2

10,80,60,40,2

0987654310

P

RE

SS

UR

E D

RO

P

FLOW RATES

[bar]

2 [ m3/h]

1,41,2

10,80,60,40,2

0987654310

FLOW RATE - PRESSURE DROP DIAGRAM DIW009/15



SIZE1/2”

L210

H197

H230

P87

Weight Kg.1,53

SIZE3/4”1”

H16262

L310310

H27676

P8888

G2525

øEv63-7563-75

Weight Kg.4,74,8

Sizes and Pressure dropsDIW009/32 - DIW009/40 - DIW009/50

DIW009/65 - DIW009/80



G

L

H2

H1

P

ø Ev

10 [ m3/h]20 400 30

[bar]

1

0,5

0

1,5

P

RE

SS

UR

E D

RO

P

FLOW RATES

P

RE

SS

UR

E D

RO

P

FLOW RATES

[bar]

1

0,5

0

1,5

10 [ m3/h]5 15 250 20

P

RE

SS

UR

E D

RO

P

FLOW RATES

[bar]

10 [ m3/h]

1

0,5

5 150

1,5

200

P

G

ø Ev

L

H1

H2

P

RE

SS

UR

E D

RO

P

FLOW RATES

2 654310

[bar]

1,4

1,2

1

0,8

0,6

0,4

0,2

0

[ m3/h]

P

RE

SS

UR

E D

RO

P

FLOW RATES[ m3/h]

[bar]

1,8

1,4

1

0,6

0

0,2

20 60504030100 70 80

FLOW RATE - PRESSURE DROP DIAGRAM DIW009/40 FLOW RATE - PRESSURE DROP DIAGRAM DIW009/50


SIZE1.1/4”1.1/2”

2”

H1858585

L410410430

H2110110110

P150150150

G373737

øEv90-11091-11091-110

Weight Kg.11,311,411,6

SIZE6580

L460460

H1151151

H2270270

P202202

G3737

øEv90-11090-110

Assembly arrangementThe assembly arrangement to be adopted isthe one in fig. 1 which also gives the distan-ces to be observed between the piping.

EXTRACT UNI 9157INSTALLATION SITEThe choice of installation site for the equip-ment should be such that the entire backflowpreventer assembly be outside any floodablezone always taking into consideration thehighest level which could be reached by thewater in the adjacent place in the event offrequent flooding. Preferable the backflowpreventer should be installed outside theentire building work and above the ground.

When the unit is placed between a systemoffers risks of pollution for the drinkingwater supply main, all supply systems fee-ding the water for plumbing or food applica-tions should be arranged upstream of thebackflow preventer while the downstreamsupply main should have distinctive signsand conventional safety colours in accordan-ce with UNI 5634 P.

The space around the backflow preventershould be sufficient to allow trouble-freeinstallation or removal. It should allow easyaccess for repairs or performance tests.

Opening of the drain valve should be such asto allow drainage by gravity of the waterflows. Piezometric connections should not be loca-ted close to the resting surface while theoperating devices should be placed on thefront face side.

The backflow preventer unit must be placedin an easily accessible, common part of thebuilding. It must be ventilated and must notbe floodable. The drain device must notcause toxic emissions in the place. The drai-ned waters should not be harmful for theenvironment: opinion of the health authori-ties must be sought for those cases coveredby current regulations. The leak recoveryunit placed under the drain spout and opera-tions for collecting the water to be drainedshould have a minimum size as according tothe following:

Size backflow preventer Size drain system

The backflow preventer should be prece-ded by a filter and should be placedbetween two shut-off valves.

METERS SUPPORTS

SOME INSTALLATION EXAMPLES

15 20 25 32 40 50 65 8040 60 60 80 80 80 80 100

CEILING / VAULT / GIRDER

GROUND / FLOOR / GANGWAY

DRAINAGEOR

TUNNEL

DRAIN PIPE




1- D

IW00

9-90

9 -

GB

- 0

6/’0

1

DIW009/15 - DIW009/50

DESIGN FEATURES- Bronze body, pins and cover- Elastomeric diaphragm.- Movable internal bar for fastening checks,

springs, seats, screws of stainless steel

Pressure control valve - Bronze body- Polished bronze ball- Carbon fibre reinforced teflon seals


- Max. temperature 65° C- Max. pressure 10 bar- Connections: DIW009/20, DIW009/25

male tailpieces, DIW009/32, DIW009/40,DIW009/50 female tailpieces

- Complete with inspection system and connection to discharge pipe of stainless steel for sizes DIW009/20 to DIW009/50.For size DIW009/15 complete with inspectable plastic discharge tundish.

DIW009/65 - DIW009/80

DESIGN FEATURES- Straightforward design, easy maintenan-

ce not requiring special tooling.- Cast iron valve body and covers finished

on the outside and inside with food-gradeepoxy resin

- Bronze valve pins, valve seats, spring guides

- Stainless steel springs- Buna N fabric reinforced diaphragm

Downstream and upstream check valves:

- Stainless steel check locking system- Silicone rubber checks - Stainless steel springs- Buna N fabric reinforced diaphragm

Downstream and upstream check valves:

- Stainless steel check locking system- Silicone rubber checks- Stainless steel springs

Specification data

- Fixed guide and removable seats made of bronze.

Pressure control valve- Bronze body- Polished bronze ball- Carbon fibre reinforced teflon seals- Bronze upstream pressure intake groove.

- Complete with inspection system and connection to discharge pipe of stainless steel.

TECHNICAL CHARACTERISTICS- Max. temperature 65° C- Max. pressure 10 bar

DIW009Compact threaded backflow preventer, with regulatedreduced pressure zone to UNI 9157 Standards.Bronze body and cover.Stainless steel springs, seats and screws.Complete with inspection system and connection todischarge pipe of stainless steel.Max. operating temperature 65° CMax. pressure 10 bar


Conforms with NF, KIWA, USC, ANSEAU, ASSE, AWWA, IAPMO.

1505115 1/2" MF1505120 3/4" MM1505125 1" MM1505132 1.1/4" FF1505140 1.1/2" FF1505150 2" FF

Part No. Size

DIW009FCompact flanged backflow preventer, with regulatedreduced pressure zone to UNI 9157 Standards.Cast iron body finished on inside and outside with 2coats of epoxy resin.Stainless steel springs.Complete with inspection system and connection todischarge pipe of stainless steel.Max. operating temperature 65° CMax. pressure 10 barFlanged connections PN 10.


Conforms with NF, KIWA, USC, ANSEAU, ASSE, AWWA, IAPMO.

1505165 651505180 80

Part No. Size

Watts Technical Catalogue

Documents

Transcript of Watts Technical Catalogue