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Flanged Butterfly Valve

The national standard flange butterfly valve is a centerline butterfly valve that complies with the Chinese national standard (GB). It is connected to the pipeline flange bolt through the valve body's built-in flange, and uses rubber or PTFE soft sealing. It is suitable for water, gas, and weakly corrosive media below PN16, and has the characteristics of bidirectional sealing, low flow resistance, and easy maintenance. It is widely used in medium and low pressure industrial pipeline systems such as chemical and water supply.

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  • Standardized design specifications
  • Multi working condition adaptability
  • Convenient maintenance and low cost
  • Quick opening and closing with precise adjustment
  • Low flow resistance and efficient circulation
  • Bidirectional pressure bearing seal
  • Simplified and lightweight structure
Standardized design specifications
  • Standardized design specifications
    01
    Compliant with GB national standards, the bi-directional pressure bearing capacity reaches PN16 level, ensuring the safety of industrial pipeline systems;
  • 02
    The flange connection size is manufactured according to GB/T standards and compatible with mainstream pipeline systems.
Multi working condition adaptability
  • Multi working condition adaptability
    01
    Suitable for temperatures ranging from -20 ℃ to+150 ℃ (rubber seal) or -20 ℃ to+200 ℃ (PTFE seal), covering conventional industrial scenarios;
  • 02
    Adapt to water, steam, oil, and weakly corrosive media by replacing sealing materials.
Convenient maintenance and low cost
  • Convenient maintenance and low cost
    01
    Modular design allows for independent replacement of seals without the need to disassemble the valve body as a whole;
  • 02
    The valve body is made of ductile iron/cast steel material, and the rubber/plastic lined valve seat is wear-resistant, reducing long-term operating costs.
Quick opening and closing with precise adjustment
  • Quick opening and closing with precise adjustment
    01
    Rotate 90 ° to complete the fully open/fully closed action, with a short response time (≤ 5 seconds) and support for frequent operations; The opening adjustment range is 0-90 °, and the flow control accuracy is better than traditional gate valves.
Low flow resistance and efficient circulation
  • Low flow resistance and efficient circulation
    01
    Full diameter flow channel design, with butterfly plate thickness as the only obstruction source, low pressure drop and flow characteristics close to linear, suitable for high flow conveying;
  • 02
    Streamlined butterfly plate optimizes fluid dynamics and reduces energy loss.
Bidirectional pressure bearing seal
  • Bidirectional pressure bearing seal
    01
    Double directional compression sealing is achieved through elastic rubber or PTFE soft sealing rings to meet the requirements of forward and reverse flow of the medium;
  • 02
    The special S-shaped conical valve seat design can adjust the sealing pressure ratio and extend the service life.
Simplified and lightweight structure
  • Simplified and lightweight structure
    01
    Adopting a symmetrical midline design, the valve body and flange are integrated into one piece, with a small number of components, small volume, and light weight, making it easy to manufacture and install;
  • 02
    The butterfly plate and valve stem have a no pin connection structure, eliminating potential leakage points and improving reliability.
Main Component Materials

Part Name

Material

valve body

Cast iron, stainless steel, chromium molybdenum steel, alloy steel

butterfly valve disc

Cast steel, alloy steel, stainless steel, chromium molybdenum steel

sealing ring

Combination of stainless steel and high-temperature resistant asbestos board into multiple layers

valve stem

2Cr13, 1Cr13 stainless steel, chromium molybdenum steel

bearing

Austenitic stainless steel, 304 nitriding

filler

flexible graphite

Performance Specifications & Dimensions
  • Nominal pressure PN
    0.6/1.0/1.6/2.5/4.0/6.4
  • Shell F
    P x 1.5
  • Sealing Pressure
    P x 1.1
  • Medium
    Air, water, steam, coal gas, oil products, as well as acids, alkalis, salts with weak corrosive media, etc
  • Temperature (℃)
    Carbon steel: -29 ℃~425 ℃/Stainless steel: -40 ℃~600 ℃


Nominal diameter
BN(mm)

Main dimensions

PN0.6MPa

PN1.0MPa

PN1.6MPa

L1

L2

H

H1

D

D1

D2

Z-Φd

bxf

D

D1

D2

Z-Φd

bxf

D

D1

D2

Z-Φd

bxf

50

108

150

275

200

140

110

90

4-14

14x3

165

125

102

4-18

18x3

165

125

102

4-18

18x3

65

112

170

303

210

160

130

110

4-14

14x3

185

145

122

8-18

18x3

185

145

122

8-18

18x3

80

114

180

324

226

190

150

128

4-18

16x3

200

160

138

8-18

20x3

200

160

138

8-18

20x3

100

127

190

380

250

210

170

148

4-18

16x3

220

180

158

8-18

20x3

220

180

158

8-18

20x3

125

140

200

460

295

240

200

178

8-18

18x3

250

210

188

8-22

22x3

250

210

188

8-18

22x3

150

140

210

490

315

265

225

202

8-18

18x3

285

240

212

8-22

22x3

285

240

212

8-22

22x3

200

152

230

600

380

320

280

258

8-18

20x3

340

295

268

12-22

24x3

340

295

268

12-22

24x3

250

165

250

655

405

375

335

312

12-18

22x3

395

350

320

12-22

26x3

405

355

320

12-26

26x3

300

178

270

780

480

440

395

365

12-22

22x4

445

400

370

12-22

26x4

460

410

378

12-26

28x4

350

190

290

875

545

490

445

415

12-22

22x4

505

460

430

16-22

26x4

520

470

438

16-26

30x4

400

216

310

910

550

540

495

465

16-22

22x4

565

515

482

16-26

26x4

580

525

490

16-30

32x4

450

222

330

1000

620

595

550

520

16-22

22x4

615

565

532

20-26

28x4

640

585

550

20-30

40x4

500

229

350

1090

680

645

600

570

20-22

24x4

670

620

585

20-26

28x4

715

650

610

20-33

44x4

600

267

390

1210

750

755

705

670

20-26

30x5

780

725

685

20-30

34x5

840

770

725

20-36

54x5

700

292

430

1350

820

860

810

775

24-26

26x5

895

840

800

24-30

34x5

910

840

795

24-36

40x5

800

318

470

1520

910

975

920

880

24-30

26x5

1015

950

905

24-33

36x5

1025

950

900

24-39

42x5

900

330

510

1570

930

1075

1020

980

24-30

26x5

1115

1050

1005

28-33

38x5

1125

1050

1000

28-39

44x5

1000

410

550

1700

980

1175

1120

1080

28-30

28x5

1230

1160

1110

28-36

38x5

1255

1170

1115

28-42

46x5

1200

470

630

2040

1220

1405

1340

1295

32-33

28x5

1455

1380

1330

32-39

44x5

1485

1390

1330

32-48

52x5

1400

530

710

2240

1310

1630

1560

1510

36-36

32x5

1675

1590

1535

36-42

48x5

1685

1590

1530

36-48

58x5

1600

600

790

2440

1460

1830

1760

1710

40-36

34x5

1915

1820

1760

40-48

52x5

1930

1820

1750

40-56

64x5

1800

670

870

2650

1560

2045

1970

1920

44-39

36x5

2115

2020

1960

44-48

56x5

2130

2020

1950

44-56

68x5

2000

760

950

2860

1670

2265

2180

2125

48-42

38x5

2325

2230

2170

48-48

60x5

2345

2230

2150

48-62

70x5

Note: The pressure range is 0.6MPa~6.4MPa. The above data is for reference only. Please consult the company's sales department for details.

Valve Application
  • Oil & Gas Transportation

    Oil and gas transportation involves multiple modes such as pipelines and ships, and is the core link of the energy supply chain.

  • Chemical Raw Material Control

    The control of chemical raw materials covers the entire process of mining, storage, and production, ensuring safety and process stability.

  • High Temperature SteamPipeline in Power System

    High temperature steam pipelines are the core of energy transmission in power systems, supporting the efficient operation of thermal and nuclear power plants.

  • Other Industries

    Valves control fluids in multiple industries such as new energy and electronics, ensuring safe and efficient production.

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