37
Relief Valves
Relief Valves For Transports And Delivery Trucks
PartNumber
Start To DischargePressure
Flow Capacity SCFM/Air Suitable ForTanks With
Surface AreaUp To:
ProtectiveCap
(Included)UL ASME
A8434N 265 PSIG3700
3659175 Sq. Ft. A8434-11B
A8434G 250 PSIG 3456
A8436N 265 PSIG10210
9839602 Sq. Ft. A8436-11B
A8436G 250 PSIG 9598
WrenchNumber A B
A8434-40 1-3/8” 3-5/16”
A8436-40 2’ 5”
Relief Valves For DOT Forklift Cylinders
7545-40
7545-14A 7545-12
A8434-11B
8545AK8545AK
8545AK
A8434GA8434 & A8436 WrenchesBobtail Application
7545-14A
7545-12
Designed for use as a primary relief valve in transports and delivery trucks with 2” and 3” NPT couplings. Low profile design.
Designed for use as a primary relief valve on forklift cylinders.
PartNumber
Start ToDischarge
Setting
ContainerConnection
ProtectiveCap
Deflectors
45O Elbow 90O Elbow
8545AK 375 PSIG 3/4” MNPT SeeDiagrams 7545-14A 7545-12
9103-54
R
R
3100-54
Cap for Relief
OctagonalWrenching
Flats
Caps for Deflection Elbows
Deflection Elbows
Typical Lift Truck ReliefValve Installation
10
20
3040
TANK VOLUME
50%
OF
6070
80
A8434G
A
A
A
B
R
1/8
3/8
1/8
1/4
1/4
7384
DO NOTUSE FORFILLING
10%
27%
12%
43%
HORIZO
T AL VERTICAL
PROPANE
R
38
Relief Valves
Relief Valves For Motor Fuel Containers
PartNumber
ContainerType
Start ToDischarge
Setting
ContainerConnection
(MNPT)
Flow Capacity SCFM/Air ProtectiveCap
(Included)
ProtectivePlug
(Optional)
PipeawayAdapter(MNPT)UL ASME
8544G
ASME
250 PSIG1” 1020 936 7544-41 7545-40 7544-11A
8543G 1-1/4” 1465 1400 7543-40C ---- 7543-10
8544T312 PSIG
1” 1282 1158 7544-41 7545-40 7544-11A
8543T 1-1/4” 1990 1731 7543-40C ---- 7543-10
8544K DOT/ASME 375 PSIG 1” 1545 ---- 7544-41 7545-40 7544-11A
7543-108543G in 420 lb. Cylinder 8544G in Motor Fuel Tank
8544G
7545-40
Designed for use as a primary relief valve on smaller ASME and DOT fuel containers.
R
1/4
E
F
1/2
3/4
90R
Relief Valves For ASME Storage Tanks
* See the relief valve cap page for additional cap options.**3” FNPT Outlet Connection.
8684G7534G
PartNumber
Start ToDischargePressure
ContainerConnection
Flow Capacity SCFM/Air Suitable ForTanks With
Surface AreaUp To:
ProtectiveCap*
PipeawayAdapter
UL ASME
7583G
250 PSIG
3/4” MNPT 1980 1806 80 Sq. Ft. 7583-40X-----
8684G 1” MNPT 2620 2565 113 Sq. Ft. 8684-40
8685G 1-1/4” MNPT 4385 4035 212 Sq. Ft. 7585-40X
7534G 2” MNPT 11675 10442 708 Sq. Ft. 7534-40 7534-20**
Designed for use as a primary relief valve in ASME storage tanks.Low profile design reduces chance of external damage or sheering.The 7534G has 3” MNPT external threads for attachment of vent stacks. The accessory 7534-20 pipeaway adapter has a break-off groove to prevent damage to the relief valve from external sheer on the vent stack.
8684G Installed
39
Relief Valves
External Relief Valves For Propane ASME Storage Tanks
3131G3135-103135G
Designed for use as a primary relief valve in ASME storage tanks. All the working components of these relief valves are outside the container connection, so the valve must be protected from physical damage. The accessory pipeaway adapters have a break-off groove to prevent damage to the relief valve from external sheer on the vent stack.
A3149G
PartNumber
Start ToDischargePressure
ContainerConnection
Flow Capacity SCFM/Air
Suitable ForTanks With
Surface AreaUp To:
Protec-tiveCap
Pipeaway Adapter
UL ASME Part Number Size
3131G
250 PSIG
3/4” MNPT 2060 ---- 85 Sq. Ft. 3131-54 3131-10 1” FNPT
W3132G 1” MNPT 3340 ---- 154 Sq. Ft.3132-54
3132-10 1-1/4” FNPT
3132G 1-1/4” MNPT 4130 ---- 200 Sq. Ft. 3132-10 1-1/4” FNPT
3135G 1-1/4” MNPT 5770 ---- 300 Sq. Ft. 3135-54 3135-10 2” FNPT
3133G 1-1/2” MNPT 6080 ---- 320 Sq. Ft. 3133-54 3133-10 2” FNPT
A3149G 2-1/2” MNPT 10390 9153 613 Sq. Ft. 3149-40 Integral 3” FNPT
External Relief Valves For NH3 ASME Storage TanksPrimarily for use on NH3 stationary storage tanks, these relief valves provide maximum safety with minimum product loss.All the working components of these relief valves are outside the container connection, so the valve must be protected from physical damage.
PartNumber
Start ToDischargePressure
ContainerConnection
Flow Capacity SCFM/Air Suitable For
Tanks WithSurface Area
Up To:Protective
Cap
Pipeaway Adapter
UL ASME Part Number Size
AA3126L250
250 PSIG
1/2” MNPT 277 ---- 23 Sq. Ft. 7545-40 AA3126-10 1/2” MNPT
AA3130UA250 3/4” MNPT 2045 1838 249 Sq. Ft. AA3130-40P AA3131-10 1 “ FNPT
AA3135UA250 1-1/4” MNPT 6430 5080 1010 Sq. Ft. AA3135-40P AA3135-10 2” FNPT
AA3130UA265265 PSIG
3/4” MNPT 2125 1912 261 Sq. Ft. AA3130-40P AA3131-10 1 “ FNPT
AA3135UA265 1-1/4” MNPT 6615 5370 1045 Sq. Ft. AA3135-40P AA3135-10 2” FNPT
AA3135UA250 AA3130UA250 AA3131-10
40
Relief Valves
DuoPort Pressure Relief Manifolds
PartNumber
ContainerConnection Application
Start ToDischargePressure
Relief Valve Included Flow Capac-ity
SCFM/Air*ULQuantity
PartNumber
InletConnection
PipeawayAdapters
8542G
2” MNPT
LP-Gas250 PSIG
2
3135MG
1-1/4” MNPT
3135-10 5250 (1)
AA8542UA250NH3
AA3135UA250AA3135-10
5865 (1)
AA8542UA265 265 PSIG AA3135UA265 5975 (1)
* Flow rating based on number of reliefs shown in parenthesis ().
MultiPort Pressure Relief Manifolds
* Flow rating based on number of reliefs shown in parenthesis ().
Designed especially for use as a primary relief device on smaller stationary storage containers with 2” NPT threaded couplings. These manifolds allow servicing or re-placement of either of the two relief valves without evacuating the container or loss of service. The operating lever selectively closes off the entrance port to the relief valve being removed while the remaining valve provides protection for the container and its contents. The rating of each manifold is based on actual flow through the manifold and a single pressure relief valve, taking friction loss into account. It is not merely the rating of the relief valve alone.
Designed especially for use as a primary relief device on large stationary pressurized storage containers with flanged openings. These manifolds incorporate an additional relief valve, not included in the flow rating, allowing for servicing or replacement of any one of the relief valves without evacuating the container. The handwheel on the manifold selectively closes off the entrance port of the relief valve being removed while the remaining relief valves provide protection for the container and its contents. All manifold flow ratings are based on flow through the relief valves after one has been removed for service or replacement.
Order Studs Separately
PartNumber Size
For UseWith For Connection To:
NumberRequired
7560-55 3/4” X 4-1/2” All RegOMultiPorts
Weld Neck Flange Mount 8
7560-56 3/4” X 3-1/2” Std Tank Pad Mount
PartNumber
ContainerFlange
Connec-tion Applica-
tion
Start ToDischargePressure
Relief Valve IncludedFlow Capacity
SCFM/Air*Quantity Part
NumberInlet
ConnectionPipeawayAdapters UL ASME
A8563G3” 300# LP or NH3
250 PSIG
3 A3149MG 2-1/2” MNPT
Integral 3” FNPT
18,500 (2) 16,292 (2)
A8564G 4 A3149MG 27,750 (3) 24,438 (3)
AA8573G
4” 300#
NH33
AA3135MUA250 1-1/4” MNPT AA3135-10 11,400 (2) -----
A8573GLP or NH3
A3149MG 2-1/2” MNPT
Integral 3” FNPT
18,500 (2) 16,292 (2)
A8574G 4 A3149MG 27,750 (3) 24,438 (3)
12
41
Relief Valves
4” Flanged Pressure Relief ValvesExchange Service OnlyThese valves are commonly found on older large storage tanks.The valve is “sandwiched” between a flange welded in the tank and a retaining flange on top of the valve which is tapped 4” FNPT to accept the vent stacks.
# 900112703” Modified FlexSealing Gasket
# 900112944” CompositionWeather Gasket
Tank Pad
Typical MountingReconditioned
4” ReliefExchange Only
(no longer manufactured)
New MBF-A4” Relief
250# Set Pressure15452 SCFM
4” Relief Stack3/4” X 4-1/2”Studs
Relief Valve Sizing for Common Large ASME TanksThe relief valves used for protection on ASME storage containers have a minimum required flow rate determined by the outside surface area of the container. The following chart lists the common large ASME storage containers and their associated required relief flow rates. When selecting relief valves for a particular tank, make sure the flow rate on the relief valve equals or exceeds the rquired flow from the chart.
TankGallons
Tank I.D. Inches O.A.L
OutsideSurface
Area sq. ft.
RequiredFlow
SCFM/AIR
2,000 46 23’ 10-3/8” 306 5,856
3,000 46 35’ 5-3/8” 441 7,907
4,000 65 24’ 11-1/2” 431 7,759
5,000 65 31’ 4-1/2” 543 9,371
6,000 72.4 30’ 8-1/4” 590 10,030
8,000 72.4 38’ 11-1/4” 748 12,207
10,000 93-11/16 29’ 9-7/8” 741 12,099
12,000 93-11/16 37’ 2-3/8” 924 14,479
15,000 93-11/16 44’ 6-3/4” 1,106 16,795
18,000 108 41’ 5” 1,186 17,796
30,000 108 65’ 9-1/2” 1,884 26,602
30,000 130 46’ 9-1/2” 1,616 22,926
TankGallons
Tank I.D. Inches O.A.L
OutsideSurface
Area sq. ft.
RequiredFlow
SCFM/AIR
35,000 130 1/4” 54’ 0” 1,865 25,786
40,000 130 1/4” 61’ 2-1/2” 2,114 28,577
45,000 130 1/4” 68’ 5” 2,363 31,309
50,000 130 1/4” 75’ 7-1/2” 2,612 33,999
55,000 130 1/4” 82’ 10” 2,861 36,625
60,000 130 1/4” 90’ 0-1/2” 3,110 39,219
65,000 130 1/4” 97’ 3” 3,359 41,775
70,000 130 1/4” 104’ 5-1/2” 3,607 44,288
75,000 130 1/4” 111’ 8” 3,856 46,780
80,000 130 1/4” 118’ 10-1/2” 4,105 49,243
85,000 130 1/4” 126’ 1” 4,354 51,679
90,000 130 1/4” 133’ 3-1/2” 4,603 54,091
SET 250 PSIGCAP
42
Rate of Discharge for LP-Gas Pressure Relief Valves Used on ASME ContainersMinimum required rate of discharge in cubic feet per minute of air for relief valves to be used on containers other than those con-structed in accordance with Interstate Commerce Commission specification.
Typical Tank Data Plate
Relief Valve Sizing for Common Domestic ASME Tanks
The relief valves used for protection on ASME storage containers have a minimum required flow rate determined by the outside surface area of the container.The following chart lists the common domestic ASME storage containers, their re-quired relief flow rates and their associated relief valves.
TankGallons
OutsideSurface
Area sq. ft.
RequiredFlow
SCFM/AIR
StandardRelief Valve
ReliefValve
Pipe Size
Relief ULFlow Rate
SCFM/AIR
120 39 1078
7583G 3/4” 1980150 48 1286
250 62 1580
325 79 1930
500 98 2300 8684G 1” 2620
1000 174 3684 8685G 1-1/4” 4385
Relief Valves
250 P.S.I. @ 125 OF INSP.STAMP
VARIOUS
AG 1989
37.42" 0.291" 0.210" 118.75"
4,167500
97 HEMI
80%
NATIONAL BOARD NO.
MAX. ALLOWABLEWORKING PRESSURE
O.S. SURFACEAREA S.F.
WATERGALS.
O.S. DIATHIS CONTAINER SHALL NOT CONTAIN A PRODUCT HAVING
A VAPOR PRESSURE IN EXCESS OF 215 PSI AT 100 OF
TYPE YR. BUILT D.T.
SHELL THK. HEAD THK. LENGTH
WATERLBS.
D.R.
MODEL
MFG. SERIAL NO.
UNO NAME TANK COMPANY
From NFPA Pamphlet #58.
Surface area = Total outside surface area of container in square feet.Flow Rate CFM Air = Required flow capacity in cubic feet per minute of air at standard conditions, 60OF and atmospheric pressure (14.7 psia).
SurfaceArea
Sq. Ft.
FlowRateCFMAir
SurfaceArea
Sq. Ft.
FlowRateCFMAir
SurfaceArea
Sq. Ft.
FlowRateCFMAir
SurfaceArea
Sq. Ft.
FlowRateCFMAir
SurfaceArea
Sq. Ft.
FlowRateCFMAir
SurfaceArea
Sq. Ft.
FlowRateCFMAir
SurfaceArea
Sq. Ft.
FlowRateCFMAir
20 or less 626 85 2050 150 3260 230 4630 360 6690 850 13540 1500 21570
25 751 90 2150 155 3350 240 4800 370 6840 900 14190 1550 22160
30 872 95 2240 160 3440 250 4960 380 7000 950 14830 1600 22740
35 990 100 2340 165 3530 260 5130 390 7150 1000 15470 1650 23320
40 1100 105 2440 170 3620 270 5290 400 7300 1050 16100 1700 2390
45 1220 110 2530 175 3700 280 5450 450 8040 1100 16720 1750 24470
50 1330 115 2630 180 3790 290 5610 500 8760 1150 17350 1800 25050
55 1430 120 2720 185 3880 300 5760 550 9470 1200 17960 1850 25620
60 1540 125 2810 190 3960 310 5920 600 10170 1250 18570 1900 26180
65 1640 130 2900 195 4050 320 6080 650 10860 1300 19180 1950 26750
70 1750 135 2990 200 4130 330 6230 700 11550 1350 19780 2000 27310
75 1850 140 3080 210 4300 340 6390 750 12220 1400 20380
80 1950 145 3170 220 4470 350 6540 800 12880 1450 20980
43
Relief Valves
Brass Hydrostatic Relief Valves
3127
Pipeaway
Stainless Steel Hydrostatic Relief Valves
SS8001 SS8021
Designed especially for the protection of piping and shutoff valves where there is the possibility of trapping LP-Gas.They may be installed in pipelines and hoses located between shutoff valves or in the side boss of RegO shutoff valves.
TypicalInstallation
Designed especially for the protection of piping and shutoff valves where there is the possibility of trapping liquid.They may be installed in pipelines and hoses located between shutoff valves or in the side boss of RegO shutoff valves.
SS8001 and SS8002 bodies have no discharge threads.
SS8021 and SS8022 bodies have discharge threads.
PartNumber
InletConnec-
tion
Start ToDischargePressure
ProtectiveCap
3127G
1/4” MNPT
250 PSIG
9103-54or
7545-40
3127H 275 PSIG
3127J 350 PSIG
3127K 375 PSIG
3127L 400 PSIG
3125L 400 PSIG 3125-40P
3127T 312 PSIG 9103-54or
7545-403127U 450 PSIG
PartNumber
InletConnec-
tion
Start ToDischargePressure
Protec-tiveCap
PipeawayThreads
SS8002G
1/2” MNPT
250 PSIG
8022-54
-----
SS8022G 3/8” FNPT
SS8002J350 PSIG
-----
SS8022J 3/8” FNPT
SS8002L400 PSIG
-----
SS8022L 3/8” FNPT
SS8002U450 PSIG
-----
SS8022U 3/8” FNPT
PartNumber
InletConnec-
tion
Start ToDischargePressure
Protec-tiveCap
PipeawayThreads
SS8001G
1/4” MNPT
250 PSIG
8001-54
-----
SS8021G 1/4” NPSM
SS8001J350 PSIG
-----
SS8021J 1/4” NPSM
SS8001L400 PSIG
-----
SS8021L 1/4” NPSM
SS8001U450 PSIG
-----
SS8021U 1/4” NPSM
The 3125L is a compact design for cramped space installations.
PartNumber
InletConnec-
tion
Start ToDischargePressure
Protec-tiveCap
Pipeaway Adapter
Part Number Size
3129G
1/2”MNPT
250 PSIG 3129-40PCap
or
7545-40as aPlug
3129-10 1/2” FNPT
3129J 350 PSIG
3129K 375 PSIG
3129L 400 PSIG
3129U 450 PSIG
44
Caps For Internal Relief Valves on Domestic Tanks
Relief Valve Caps
Caps For External Relief Valves Caps For Forklift Relief ValvesThese caps fit over the deflec-tion elbow threaded into the relief valve.
8545AK
Shower Cap Style
Part No Used On
85 1/2” and 3/4” Valves
85A 3/4” thru 1-1/4” Valves
Flip TopWeather Caps
Part NoFits OverNPT Size
ClampingRange (inches)
WC0 3/4” 1 to 1-3/16
WC1 1” 1-1/4 to 1-7/16
WC2 1-1/4” 1-1/2 to 1-11/16
WC3 1-1/2” 1-3/4 to 1-15/16
WC5 2” 2-1/4 to 2-7/16
WC8 2-1/2” 3 to 3-3/16
WC10 3” 3-1/2 to 3-11/16
WC14 4” 4-1/2 to 4-11/16DO
NOT
REMOVE
COVER
RELIEF
VALVE
85A
CAUTION
R3100-54
7583-40 Capon 7583G
3131-54 Capon 7583G
8684-40 Capon 8684G
3131-54 Capon 8684G
7585-40X Capon 8685G
3132-54 Capon 8685G
Caps with rings (included with new relief valve) Yellow closure caps
8545AK
This cap fits directly over the forklift relief valve.
CapPart No
ReliefOD
Used OnRegO #
3125-40P 5/8” 3125 1/4” NPT
8001-54 3/4” SS8001 1/4” NPT
9103-54 7/8” 3127 1/4” NPT
8022-54 1” SS8002 1/2” NPT
3129-40P 1-1/8” 3129 1/2” NPT
3131-54 1-3/4” 3131 3/4” NPT
3132-54 2-11/32” 3132 1-1/4” NPT
3135-54 2-3/4” 3135 1-1/4” NPT
3133-54 3-1/8” 3133 1-1/2” NPT
7545-40 Can be used as a plug on3129 1/2” NPT
9103-54
R
7545-40
R
R
R
1-1/
4” R
elie
f10
00 G
al T
anks
1-1/
4” R
elie
f10
00 G
al T
anks
1” R
elie
f50
0 G
al T
anks
1” R
elie
f50
0 G
al T
anks
3/4”
Rel
ief
Smal
l Tan
ks
3/4”
Rel
ief
Smal
l Tan
ks
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