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.





Part Name | Material |
valve body | cast iron |
valve body | cast iron |
valve disc | Steel+reinforced nylon fabric+NBR |

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

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

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

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


