Concentric Butterfly Valve - HABLEM · Concentric Butterfly Valves The Concentric Design CCENTER OF...

139-12, 1430 beon-gil, Seobu-ro, Juchon-myun, Gimhae-si, Gyeongsangnam-do, Korea.

▶TEL +82-55-310-8000▶FAX +82-55-329-0656~8▶E-mail [email protected]▶Homepage www.acevalve.co.kr

Concentric Butterfly Valve

Concentric Butterfly Valve

ACE VALVE PRODUCT GUIDEBOOK | C-3ACE VALVE PRODUCT GUIDEBOOK | C-2

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Specification of Concentric Butterfly Valve

The valve shall be capable of bi-directional flow with bubble tightshut-off at full rating pressure.

TYPE NUMBERING SYSTEM• AV-CWR Concentric WAFER type Rubber lined Butterfly Valves• AV-CSR Concentric SEMI-LUG type Rubber lined Butterfly Valves• AV-CLR Concentric LUG type Rubber lined Butterfly Valves• AV-CFR Concentric FLANGE type Rubber lined Butterfly Valves

PRODUCTION RANGE• SIZE : DN 50mm (2 inch) ~ DN 4000mm (160 inch) • RATING PRESSURE : UP to 20 bar depend on related size • RATING TEMPERATURE : -20℃ ~ +200℃

APPLICABLE FLANGE• KS/JIS 5K, 10K, 16K • ASME B 16.1 Class 125LB • ASME B 16.5 Class 150LB • EN 1092 PN6, PN10, PN16• ISO 7005 PN6, PN10, PN16

STANDARD COMPLIANCE• ACE Concentric Butterfly valves conform to ISO 5752, KSV 7490, JIS F 7480, JIS B 2032, API 609, BS 5155, DIN2501.

Concentric Butterfly Valves

The Concentric DesignCCENTER OF SHAFT / 'Seat in the 'Center of Valve Body' Applicable for BUTTERFLY VALVE WITH ELASTOMER LINING.

Classification by Connection type

• Symmetric disc design ensures favorable flow characteristics and low pressure drop• Concentric shaft ensures low operating torque• Lining gives a good protection to valve body, and acts as flange gasket - Shaft penetrates the valve seat - Limited choice of seating materials(Elastomer, only)

VALVE BODY

SHAFT

DISCCLOSE

DISCOPEN

TypeAppearance General Characteristics

AV-CWR(WAFER)

• General Applications - Shipbuilding, water works, heating and ventilation, power plants, oil refinery chemical plants etc.• Valve to be installed by long bolts between the flanges of adjacent pipe only • Easy handling and light weight.• Easy installation, less bolt quantity and low cost.• Inconvenient maintenance of adjacent pipe.

AV-CSR(SEMI-LUG)

• General Applications - Shipbuilding, water works, heating and ventilation, power plants, oil refinery chemical plants etc.• Similar as wafer type except a pair of the tap bolt hole in way of upper and lower sides for easy maintenance of adjacent pipe.• Easy handling and light weight.• Easy installation, less bolt quantity and low cost.• Keep liquid remained during repairing adjacent pipe.

AV-CLR(FULL-LUG)

• General Applications : general piping system pump outlets, tank drains, ship sides etc.• Ring shape bolt hole for bolting with flange of connecting pipe.• Keep pressure inside during repairing adjacent the other side pipe.• Different flange shape.• Possible damage on full face gasket.• Hard repairing of corroded bolt.• More man-hour for installation and body can be cracked by misaligned thread.• Heavy weight.

AV-CFR(FLANGE)

• General Applications - Shipside valves, ballast valves, water works, power plants, etc all piping system.• Both ends with complete flange.• Suitable to general pipe flange.• Suitable for shipside valve in the ship.• Heavy weight.• Same installation as ordinary valve.

Schema of concentric typeThe valve shall be a 90° turn clockwise to close, non-jamming, resilient seated valve for zero leakage service.The valve shall be torque seated and designed in such a manner that the disc can not be rotated freely at the closed position.Also this valve enables the fluid perfect shut-off regardless of the flow direction.

OperationsThe various operator of the valve is available depend on the valve location, driving medium and dedicated service of the valve to be provided.

• Manual lever operation• Manual worm gear operation• Pneumatic actuator operation• Hydraulic actuator operation• Electric motor actuator operation

Construction of Materials


MATERIAL

CAST IRON / DUCTILE IRONSTAINLESS STEEL / CARBON STEEL(NICKEL) ALUMINUM BRONZE

STAINLESS STEEL / ALLOY STEEL(NICKEL) ALUMINUM BRONZE

NBR / VITON / SILICON / EPDM

STAINLESS STEEL(SS304, 316, 410, 420,17-4PH ) / MONEL / DUPLEX

STAINLESS STEEL OR MONEL

RUBBER SAME AS SEAT MATERIAL

BRONZE / STAINLESS STEEL / STEEL(HOT DIP GALV.)

STAINLESS STEEL

PTFE + PB

RUBBER SAME AS SEAT MATERIAL

CARBON STEEL / STAINLESS STEEL AL-BRONZE / MILD STEEL

STEEL / STAINLESS STEEL

MILD STEEL / IF NECESSARY

PART NAMENO.

BODY1

DISC2

SEAT3

STEM4

56

7

89

10

11

12

13

DISC PIN

O-RING

PACKING GLAND

GLAND BOLT

BEARING

O-RING

BOTTOM COVER

BOLT & WASHER

KEY

813

7

1

3

2

9

11

6

9

4

5

1012

unit : mm

Concentric Wafer Type


Concentric Semi-Lug Type

2"

2.5"

3"

4"

5"

6"

8"

10"

12"

14"

16"

18"

20"

50

65

80

100

125

150

200

250

300

350

400

450

500

43

46

46

52

56

56

60

68

78

78

102

114

127

216

239

258

293

326

353

435

535

611

655

755

797

883

55

66

75

95

115

130

155

215

251

270

325

347

383

128

140

150

165

178

190

230

270

310

335

370

390

420

33

33

33

33

33

33

50

50

50

50

60

60

60

9

9

9

12

12

12

17

17

22

27

27

27

36

F07

F07

F07

F07

F07

F07

F10

F10

F10

F10

F14

F14

F16

70

70

70

70

70

70

102

102

102

102

140

140

165

90

90

90

90

90

90

125

125

125

125

175

175

210

4-9

4-9

4-9

4-9

4-9

4-9

4-12

4-12

4-12

4-12

4-18

4-18

4-22

7

8

8

9

11

13

17

24

36

58

91

102

145

mminch

SIZE

L H H1 H2 H3SQ TYPE ΦN ΦM N -ΦZ

WEIGHT(APPROX.)

(kg)

STEM TOP FLANGEVALVE DIMENSIONS

DN 400(16˝) and OVERDN 200(8˝) and BELOW

DN 250(10")~350(14")


DN 800(32˝) and OVER

H4

H3

H3

H2H2

H1

H1

H

H

N-ΦZ

L

ΦN

ΦM

ΦD

S.Q

LH3

H2H1

H

H3H2

H1

H

S.Q

N- Z

N M

2"

2.5"

3"

4"

5"

6"

8"

10"

12"

14"

16"

18"

20"

22"

24"

26"

28"

30"

32"

34"

36"

40"

44"

48"

50

65

80

100

125

150

200

250

300

350

400

450

500

550

600

650

700

750

800

850

900

1000

1100

1200

43

46

46

52

56

56

60

68

78

78

102

114

127

154

154

165

165

190

190

210

203

216

240

254

216

239

258

293

326

353

435

535

611

655

755

797

883

967

1028

1095

1150

1230

1352

1382

1488

1645

1740

1880

55

66

75

95

115

130

155

215

251

270

325

347

383

425

453

490

515

550

592

612

658

725

760

840

128

140

150

165

178

190

230

270

310

335

370

390

420

462

495

525

555

590

640

650

700

770

830

890

33

33

33

33

33

33

50

50

50

50

60

60

80

80

80

80

80

80

90

120

130

150

150

150

14

14

14

19

19

19

22

25

32

32

40

40

45

50

65

65

65

65

65

80

80

95

95

95

5x5

5x5

5x5

6x6

6x6

6x6

8x7

8x7

10x8

10x8

12x8

12x8

14x9

14x9

20x12

20x12

20x12

20x12

20x12

22x14

22x14

25x14

25x14

25x14

9

9

9

12

12

12

17

17

22

27

27

27

36

36

50

50

50

50

-

-

-

-

-

-

33

33

33

33

33

33

50

50

50

50

60

60

80

80

80

80

80

90

-

-

-

-

-

-

F07

F07

F07

F07

F07

F07

F10

F10

F10

F10

F14

F14

F16

F16

F16

F16

F16

F16

F25

F25

F25

F30

F30

F30

70

70

70

70

70

70

102

102

102

102

140

140

165

165

165

165

165

165

254

254

254

298

298

298

90

90

90

90

90

90

125

125

125

125

175

175

210

210

210

210

210

210

300

300

300

350

350

350

4-9

4-9

4-9

4-9

4-9

4-9

4-12

4-12

4-12

4-12

4-18

4-18

4-22

4-22

4-22

4-22

4-22

4-22

8-18

8-18

8-18

8-23

8-23

8-23

10

11

11

12

13

15

19

37

47

67

91

104

154

191

240

272

305

373

403

526

607

829

1031

1212

unit : mm

KEYSIZE

ΦDH4H2H1HL

mminch

SIZE

TYPE

WEIGHT(APPROX.)

(kg)ΦN ΦM N -ΦZSQUARE

STEM TOP FLANGE

SQ H3

VALVE DIMENSIONS


Concentric Lug Type Concentric Flange Type


DN 800(32˝) and OVERH2

H

H1H3

N-ΦZ

ΦN

ΦM

SQ

ΦD

H4

L

DN 400(16˝) and OVERDN 80(3˝)~ 350(14˝)

DN 800(32˝) and OVER

H

H1H3

ΦD

H4

SQ

L

ΦN

ΦM

2"

2.5"

3"

4"

5"

6"

8"

10"

12"

14"

16"

18"

20"

22"

24"

26"

28"

30"

32"

34"

36"

40"

44"

48"

50

65

80

100

125

150

200

250

300

350

400

450

500

550

600

650

700

750

800

850

900

1000

1100

1200

43

46

46

52

56

56

60

68

78

78

102

114

127

154

154

165

165

190

190

210

203

216

240

254

216

239

258

293

326

353

435

535

611

655

755

797

883

967

1028

1095

1150

1230

1352

1382

1488

1645

1740

1880

55

66

75

95

115

130

155

215

251

270

325

347

383

425

453

490

515

550

592

612

658

725

760

840

128

140

150

165

178

190

230

270

310

335

370

390

420

462

495

525

555

590

640

650

700

770

830

890

33

33

33

33

33

33

50

50

50

50

60

60

80

80

80

80

80

80

90

120

130

150

150

150

14

14

14

19

19

19

22

25

32

32

40

40

45

50

65

65

65

65

65

80

80

95

95

95

5x5

5x5

5x5

6x6

6x6

6x6

8x7

8x7

10x8

10x8

12x8

12x8

14x9

14x9

20x12

20x12

20x12

20x12

20x12

22x14

22x14

25x14

25x14

25x14

9

9

9

12

12

12

17

17

22

27

27

27

36

36

50

50

50

50

-

-

-

-

-

-

33

33

33

33

33

33

50

50

50

50

60

60

80

80

80

80

80

90

-

-

-

-

-

-

F07

F07

F07

F07

F07

F07

F10

F10

F10

F10

F14

F14

F16

F16

F16

F16

F16

F16

F25

F25

F25

F30

F30

F30

70

70

70

70

70

70

102

102

102

102

140

140

165

165

165

165

165

165

254

254

254

298

298

298

90

90

90

90

90

90

125

125

125

125

175

175

210

210

210

210

210

210

300

300

300

350

350

350

4-9

4-9

4-9

4-9

4-9

4-9

4-12

4-12

4-12

4-12

4-18

4-18

4-22

4-22

4-22

4-22

4-22

4-22

8-18

8-18

8-18

8-23

8-23

8-23

10

11

13

15

20

22

31

47

59

85

130

154

263

270

314

377

389

493

597

912

956

1209

1753

2053

unit : mm

KEYSIZE

ΦDH4H2H1HL

mminch

SIZE

TYPE

WEIGHT(APPROX.)

(kg)ΦN ΦM N -ΦZSQUARE

STEM TOP FLANGE

SQ H3

VALVE DIMENSIONS

* For DN 3400 and larger, It is available upon request.

WEIGHT(APPROX.)

(kg)KEYSIZE

ΦDH4H2H1HL

mminch

SIZE

TYPE ΦN ΦM N -ΦZSQUARE

STEM TOP FLANGE

SQ H3

2"2.5"3"4"5"6"8"10"12"14"16"18"20"22"24"26"28"30"32"34"36"40"44"48"52"56"60"64"72"80"88"96"104"112"120"128"

506580100125150200250300350400450500550600650700750800850900

100011001200130014001500160018002000220024002600280030003200

40406060100100100110110120130150160170170170180190200210230250280300300330330360360457500550550600600600

249271288318351388470535611655755797883967

1028109511501230135213821488164517401880204821292259245027013020315533653575378041204320

8898

105120140165190215251270325347383425453490515550592612658725760840938949

1024112012211390146515651665175518801980

12814015016517819023027031033537039042046249552555559064065070077083089095010001055115012701400145015501650175519402040

33333333333350505050606080808080808090

120130150150150160180180180210230240250260270300300

141414191919222532324040455065656565658080959595

115130140140160190210220230240240260

5x55x55x56x66x66x68x78x710x810x812x812x814x914x9

20x1220x1220x1220x1220x1222x1422x1425x1425x1425x1432x1832x1836x2036x2040x2245x2550x2850x2850x2856x3256x3256x32

999

12121217172227272736365050505050-----------------

33333333333350505050606080808080809090-----------------

F07F07F07F07F07F07F10F10F10F10F14F14F16F16F16F16F16F16F25F25F25F30F30F30F30F35F35F35F35F48F48F48F60F60F60F60

707070707070102102102102140140165165165165165165254254254298298298298356356356356560560560686686686686

909090909090125125125125175175210210210210210210300300300350350350350415415415415483483483603603603603

4-94-94-94-94-94-94-124-124-124-124-184-184-224-224-224-224-224-228-188-188-188-238-238-238-238-338-338-338-33

12-3812-3812-3820-3820-3820-3820-38

14 14 16 22 29 35 47 66 78 100 147 174 222 271 323 364 415 525 599 708 854 1071 1240 1553 1744 2052 2781 3587 4116 4905 60517197 8106

10161 11018 13222

unit : mmVALVE DIMENSIONS

WEIGHT(APPROX.)

(kg)

Range of ApplicationsButterfly valves provide a bubble tight seal. They are used to shut-off, throttle and regulate highly corrosive gases, liquids, slurries and powders. Butterfly valves are designed to handle a variety of applications to the semi conductor, chemical, petrochemical, pulp and paper, mining, food and beverage, sugar refining, sewage, air pollution control, oil and gas, and chemical carrier, shipbuilding industries etc.

Butterfly Valve with Teflon Lining Butterfly Valve with Teflon Lining

NO. PART NAME

1

2

3

4

5

6

7

8

9

MATERIAL

DUCTILE IRONSTAINLESS STEELCARBON STEEL

STAINLESS STEEL

PTFE

STAINLESS STEEL

PTFE

STAINLESS STEEL

STAINLESS STEEL

STAINLESS STEEL

STAINLESS STEEL

BODY

DISC

SEAT

STEM

PACKING

GLAND

BUSH

GLAND BOLT

DISC PIN

AV-TLW(WAFER) AV-TLL(LUG) AV-TLF(FLANGE)VALVE TYPE

Valve Nominal Size

Applicable Flange

Working Temperature Range

Face to Face

Allowable Temperature in continuous use

Operations

50A~500A(2"~20") 50A~600A(2"~24") 50A~600A(2"~24")

JIS / KS 5K, 10KASME B 16.5 CLASS 150LB

LEVER, WORM GEAR, PNEUMATIC CYLINDERELECTRIC MOTOR, HYDRAULIC ACTUATOR

-20℃ ~ +250℃

-10℃ ~ +230℃

KSV 7490, JIS F7480, ISO 5752 (Table 6)


1

8654

75 3

92

H3H2

H1

H

S.QΦM

N-ΦZ

ΦN

VALVE DIMENSIONS unit : mm

2"

2.5"

3"

4"

5"

6"

8"

10"

12"

14"

16"

18"

20"

24"

50

65

80

100

125

150

200

250

300

350

400

450

500

600

43

46

46

52

56

56

60

68

78

78

102

114

127

154

216

239

258

293

326

353

435

535

611

655

755

797

883

1028

55

66

75

95

115

130

155

215

251

270

325

347

383

453

128

140

150

165

178

190

230

270

310

335

370

390

420

495

33

33

33

33

33

33

50

50

50

50

60

60

80

80

9

9

9

12

12

12

17

17

22

27

27

27

36

50

F07

F07

F07

F07

F07

F07

F10

F10

F10

F10

F14

F14

F16

F16

70

70

70

70

70

70

102

102

102

102

140

140

165

165

90

90

90

90

90

90

125

125

125

125

175

175

210

210

4-9

4-9

4-9

4-9

4-9

4-9

4-12

4-12

4-12

4-12

4-18

4-18

4-22

4-22

3

4

4

5

6

8

12

19

30

43

70

86

128

211

mminch

SIZE

L H H1 H2 H3SQ TYPE ΦN ΦM N -ΦZ

WEIGHT(APPROX.)

(kg)

STEM TOP FLANGE


The following chart shall be used as a general guide.

Application suggested derives from recommendation given by elastomer manufacturer.

The resistance can be affected by type of fluid, concentration, temperature, pressure, flow rate or evaporation of the medium.

The final choice is to be taken by the customer, in consideration of characteristics and specific application.

MATERIAL

Fresh WaterSea WaterBrineEstersAlkalisOzoneAlcoholsBrake FluidTreated Water With Caustic Soda

Fresh WaterSea WaterTreated Water With Caustic SodaHydrocabonsNatural GasOil and FatAirGasoline

AcidsAlkalis

SolventsCorrosive ProductsKetonesAcidOzoneOilsFatsGreasesSolvents

FoodBeverage

GENERAL APPLICATION SERVICE TEMPERATURE NOT RECOMMENDED FOR

Elastomer General Chart

HydrocarbonsOilsFatsGreases

EPDM

NBR

SBR

SILICONE

TEFLON

NEOPRENE

-15℃ ~ + 120℃(for intermittent opration)

0℃ ~ + 100℃(Allowable temperature

in continuous use)

-10℃ ~ + 100℃℃(Allowable temperature

in continuous use)0℃ ~ + 70℃

(L-NBR -50℃ ~ 70℃)

-20℃ ~ + 80℃

-15℃ ~ + 150℃

-60℃ ~ +230℃(PTFE -196℃ ~ + 230℃)

-20℃ ~ + 90℃

SolventsBenzeneXylol

VITON -15℃~ + 230℃℃

SteamEsterFreon22AlkalisSolventsKetones

AcidsOilsHydrocarbons

SteamSolventsHydrocarbons

Fluid Containing PowdersAlkalineGaseous Fluorine

KetonesThinnersConcentrated Acids

2"2.5"3"4"5"6"8"10"12"14"16"18"20"22"24"26"28"30"32"34"36"40"

506580100125150200250300350400450500550600650700750800850900

1000

43464652565660687878102114127154154165165190190210203216

4448888

121212161620202024242424242428

M12M12M16M16M16M16M20M20M20M22M22M22M22M24M24M24M24M30M30M30M30M30

44888812121616162020202424242428282828


4448888

121212161620202024282828323236

5/8"5/8"5/8"5/8"3/4"3/4"3/4"7/8"7/8"1"1"

1 ⅛"

1 ⅛"

1 ¼"1 ¼"1 ¼"1 ¼"1 ¼"1 ½"1 ½"1 ½"1 ½"

Bolting Dimensions (Wafer & Semi-Lug Type)

SEMI-LUG TYPESIZE

inch mmFACE TO

FACE Q’TY

JIS 5K

BOLT Q’TY

JIS 10K

BOLT Q’TY

ASME 150LB

BOLT

506580

100125150200250300350400450500

43464652565660687878

102114127

2"2.5"3"4"5"6"8"

10"12"14"16"18"20"

10101313131316161618181818

13131313161616181818191919

16181820202224262830303032

14141416161820222224242424

20222224242626303234363840

16181818202222242426283030

4448888121212161620

M12M12M16M16M16M16M20M20M20M22M22M22M22

448888

12121616162020

M16M16M16M16M20M20M20M22M22M22M24M24M24

FLANGE(T) 5K FLANGE(T) 10K JIS 5K JIS 10KNUT(T)

5KNUT(T)

10K CASTIRON

CASTSTEEL

SIZEFACE TO

FACE

WAFER TYPE

CASTIRON

CASTSTEEL Q’TY BOLT

SIZEQ’TY BOLT

SIZEinch mm


G1 G3

T1 T3

L1 L3

OPERATOR POSITION

Bolting Dimensions (Lug Type)

GEARTYPE

LEVERTYPE

NAME PLATE

OPEN

NAME PLATE

CLOSE

*STANDARD

*STANDARD

CLOSE

OPEN

NAME PLATE

OPEN

NAME PLATE

CLOSE

*STANDARD

*STANDARD

CLOSE

OPEN

NAME PLATE

OPEN

NAME PLATE

CLOSE

*STANDARD

*STANDARD

CLOSE

OPEN

NAME PLATE

OPEN

NAME PLATE

CLOSE

*STANDARD

*STANDARD

CLOSE

OPEN

Bolting Dimensions (Flange Type)

“A”Type boltMachine bolt

“B”Type boltMachine bolt+Nut

Valve Spindle Extension

JOINT

506580

100125150200250300350400450500550600650700750800900

1000

506580

100125150200250300350400450500550600650700750800850900

1000

43464652565660687878

102114127154154165165190190203216

40406060100100100110110120130150160170170170180190200210230250

2"2.5"3"4"5"6"8"

10"12"14"16"18"20"22"24"26"28"30"32"36"40"

2"2.5"3"4"5"6"8"

10"12"14"16"18"20"22"24"26"28"30"32"34"36"40"

161818202022242628303030323232343436363840

--

1820202224262830303032323234343636383840

141414161618202222242424242626262628283032

--

1416161820222224242424262626262828283032

202222242426263032343638404244464850525458

--

2224242626303234363840424446485052525458

161818182022222424262830303232343436363840

--

1818202222242426283030323234343636363840

44488881212121616202020242424242428

4448888121212161620202024242424242428

M12M12M16M16M16M16M20M20M20M22M22M22M22M24M24M24M24M30M30M30M30


448888121216161620202024242424282828

44888812121616162020202424242428282828

M16M16M16M16M20M20M20M22M22M22M24M24M24M30M30M30M30M30M30M30M36


FLANGE(T) 5K

FLANGE(T) 5K

FLANGE(T) 10K

FLANGE(T) 10K

JIS 5K

JIS 5K

JIS 10K

JIS 10K

CASTIRON

CASTIRON

CASTSTEEL

CASTSTEEL

SIZE

SIZE

FACE TOFACE

FACE TOFACE

CASTIRON

CASTIRON

CASTSTEEL

CASTSTEEL

Q’TY

Q’TY

BOLTSIZE

BOLTSIZE

Q’TY

Q’TY

BOLTSIZE

BOLTSIZE

inch

inch

mm

mm

ACE VALVE PRODUCT GUIDEBOOK | C-18

Method for Carrying & Keeping Ace Valve Certificates

How to Install Butterfly Valve

Aligning of Flange Gaskets

Centering & Flanging of Valve

Bolts spanned, disc edge with inbody face-to-face.No disc edge damage,propersealing allowed

• Be careful not to get a scratch on Disc edge and Seat ring. The openings must be protected by plywood or other things when carrying valve.• Valve must not be shocked and shaken too much. It may cause the crack of neck, lever, handle and body• Valve must be protected from sunlight.• Valve to be kept and transported under partially opened.• The suitable temperature from -10℃ to 70℃ and humidity between 10% ~ 60% to be maintained.• During valve storage, check the smooth operation once per month.

Aligning of Flange bolts

Piping misaligned:Result-DiscO.D. touches pipe I.D. causing disc edge damage. Increased torque & leakage.Seat face, seals improperly withoutengagement

Piping aligned properly when bolts tightened, disc in full open position:Result-disc clears adjacent pipeI.D., seat face seals properly, noexcessive initial torque.

WRONG ▲

WRONG ▲ WRONG ▲

CORRECT ▲

CORRECT ▲ CORRECT ▲

Disc in closed position:gasketsused:Results-Seat distorted andover compressed causing highinitial unseating torque problems

ACE VALVE PRODUCT GUIDEBOOK | C-19

ACE VALVE has provided the best quality products by using accumulated technological knowhow and the most advanced machinery.Now we challenge the whole world market of butterfly valve

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