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China Ductile Iron Dual Check Valve Suppliers - Factory Direct Double Disc Swing Check Valve with Non-Return Spring Type
product specification
| Product Name | Check Valve | Material | Ductile Iron/Stainless Steel |
| Type | Double disc | Medium | Water/Sea water |
| Size | DN50-DN1200 | Seal | EPDM/NBR rubber |
| Power | Automatic | Standard | DIN/ANSI/GOST/JIS/BS |
product description
As a key fluid control device, the core function of a check valve is to ensure that the fluid can only flow in one direction.
The lift check valve is a common type. The disc moves up and down perpendicular to the direction of fluid flow. When the fluid flows forward, the disc is lifted up, enabling the fluid to pass. When the fluid flows in the reverse direction, the disc drops to close the passage under its own gravity.
The pilot - operated check valve uses a pilot system to control the opening and closing of the main disc. It can respond quickly under a small pressure difference to effectively control the fluid. This type of check valve is widely used in some occasions with high requirements for control accuracy.
Thanks to their unique functions, check valves play an indispensable role in many industrial processes, effectively avoiding various problems caused by fluid back - flow.
Frequently Asked Questions
What is the primary function of a check valve?
The core function of a check valve is to ensure that fluid can only flow in one single direction, effectively preventing any potential back-flow within the piping system.
How does a lift check valve operate?
In a lift check valve, the disc moves up and down perpendicular to the fluid flow path. Forward fluid pressure lifts the disc to allow passage, while reverse flow drops the disc automatically under gravity to seal the valve.
What are the benefits of a pilot-operated check valve?
A pilot-operated check valve utilizes an integrated pilot system to control the main disc. This design allows it to respond rapidly even under very small pressure differences, making it ideal for systems requiring high control precision.
What materials and standards are available for these check valves?
These check valves are constructed from high-grade Ductile Iron or Stainless Steel with EPDM/NBR rubber seals. They are fully compliant with major international standards including DIN, ANSI, GOST, JIS, and BS.
What working mediums are suitable for these check valves?
Featuring robust construction and reliable rubber sealing (EPDM/NBR), these check valves are exceptionally suited for water and sea water distribution systems.