Ductile Iron Dual Check Valve with Non-Return Spring - China Suppliers and Factory for Reliable Fluid Control
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.
Frequently Asked Questions
Q: What is the core function of a check valve?
The core function of a check valve is to ensure that the fluid can only flow in one direction, acting as a key fluid control device in industrial processes.
Q: How does a lift check valve work?
In a lift check valve, the disc moves up and down perpendicular to the fluid flow direction. Forward flow lifts the disc to allow passage, while reverse flow causes the disc to drop under gravity, closing the passage.
Q: What are the advantages of a pilot-operated check valve?
A pilot-operated check valve uses a pilot system to control the main disc. It responds quickly under small pressure differences, offering high control accuracy for demanding applications.
Q: What materials and seals are available for these check valves?
The check valves are constructed from Ductile Iron or Stainless Steel, and utilize EPDM or NBR rubber seals to suit different media like water and sea water.
Q: What sizes and standards do these check valves conform to?
These check valves are available in sizes ranging from DN50 to DN1200 and comply with DIN, ANSI, GOST, JIS, and BS standards.
Q: Why are check valves indispensable in industrial piping systems?
They play an indispensable role by preventing fluid back-flow, thereby avoiding various operational problems and damage within industrial fluid processes.