Rubber Flap Check Valve

Essence: A valve that uses rubber valves to achieve one-way opening and closing, and blocks medium backflow through elastic sealing.


Core features:

Rubber flap structure (steel plate+rubber composite material), combining elasticity and rigidity, with strong sealing and corrosion resistance;

Low flow resistance full bore design, suitable for water, sewage, and weakly corrosive liquids;

Quick closure (small stroke angle) effectively prevents water hammer and protects the pipeline system.

Typical applications: Anti backflow scenarios such as water supply and drainage pump outlets, chemical pipelines, and reservoirs.

  • Slow closing function and system protection
  • Compact structure and easy maintenance
  • Low flow resistance and full channel optimization
  • Corrosion resistant and long-life materials
  • Elastic sealing and rapid response design
Slow closing function and system protection
  • Staged closing mechanism
    01
    The closing process includes rapid closing (85% -90% stroke) and slow closing stages (10% -15% stroke), with the buffer cylinder adjusting the slow closing time (1-15 seconds) to reduce damage to the pump body caused by water hammer impact.
Compact structure and easy maintenance
  • 01
    Simplified components
    only including valve body, valve cover, and rubber disc, with small volume, light weight, and easy installation and maintenance;
  • 02
    Double flange connection
    standard flange interface, can be used with compensators to simplify pipeline system integration.
Low flow resistance and full channel optimization
  • 01
    Full flow area design
    There is no reduction in diameter inside the valve body, the flow cross-sectional area is consistent with the pipeline, the head loss is small, and it is suitable for low viscosity media such as clean water and oil;
  • 02
    Bidirectional sealing compatibility
    supports horizontal or vertical installation, adapts to different pipeline layout requirements.
Corrosion resistant and long-life materials
  • 01
    Composite material adaptation
    The valve body is made of cast iron or stainless steel, and the sealing surface is covered with corrosion-resistant rubber (such as fluororubber), which is suitable for corrosive media such as acid, alkali, seawater, etc;
  • 02
    Anti erosion optimization
    Rubber flap substrate reinforcement design reduces medium erosion and wear, with a service life of up to 30 years.
Elastic sealing and rapid response design
  • 01
    Rubber flap structure
    composed of steel plate, reinforced nylon cloth substrate, and rubber outer layer, it combines elasticity and rigidity. When closed, the rubber flap evenly adheres to the valve seat, achieving leak free sealing;
  • 02
    Quick opening and closing
    With a stroke angle of only 35 ° and fast closing speed, it effectively blocks the backflow of the medium and reduces the risk of water hammer.
Main Component Materials

Part Name

Material

valve body

cast iron

valve body

cast iron

valve disc

Steel+reinforced nylon fabric+NBR

Performance Specifications & Dimensions
  • Nominal Pressure PN
    1.0/1.6/2.5
  • Shell F
    Px1.5
  • Sealing Pressure
    Px1.1
  • Medium
    Water and weakly corrosive fluids
  • Temperature (℃)
    0~80℃

Nominal Diameter
DN(mm)

L1

L2

D

D1

N-Φd

PN1.0MPa

PN1.6MPa

PN1.0MPa

PN1.6MPa

PN1.0MPa

PN1.6MPa

50

203

203

160

160

125

125

4-18

4-18

65

216

216

180

180

145

145

4-18

4-18

80

241

241

195

195

160

160

4-18

8-18

100

292

292

215

215

180

180

8-18

8-18

125

330

330

245

245

210

210

8-18

8-18

150

355

356

285

285

240

240

8-23

8-23

200

457

495

335

335

295

295

8-23

12-23

250

533

622

390

405

350

355

12-23

12-25

300

610

698

440

460

400

410

12-23

12-25

350

686

787

500

520

460

470

16-23

16-25

400

762

813

565

580

515

525

16-25

16-30

450

864

914

615

640

565

585

20-25

20-30

500

914

978

670

705

620

650

20-25

24-34

600

1067

1295

780

840

725

770

20-30

20-41

700

1150

1448

895

910

840

840

24-30

24-41

800

1300

1448

1015

1025

950

950

24-33

24-41

900

1420


1115




28-33


1000

1530


1230




32-41


Note: The pressure range is 1.6MPa~2.5MPa. 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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