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China Brass Dual Check Valve Factory Suppliers - Reliable Non-Return Spring Rubber Seal for Backflow Prevention
Product Specification
| Product Name | Check Valve | Material | Brass |
| Type | Double disc | Medium | Water/Sea water |
| Size | DN50-DN1200 | Seal | Rubber |
| Power | Automatic | Standard | DIN/ANSI/GOST/JIS/BS |
Product Description
Check valves are crucial types of valves in industrial systems. Their primary function is to prevent the back-flow of media, ensuring the safe and stable operation of the system.
A common type is the swing check valve. It has a swingable disc. When the media flows in the forward direction, the disc is pushed open, allowing the media to pass through. However, when there is a tendency for the media to flow back, the disc quickly closes under the action of gravity and the reverse pressure of the media to prevent back-flow.
The double-disc check valve consists of two semi-circular discs. When the fluid flows forward, the discs open and the fluid passes smoothly. Once the fluid tries to flow in the reverse direction, the two discs close rapidly. This structure makes the double-disc check valve small in size, light in weight and easy to install.
Check valves are widely used in fields such as water supply and drainage, and petrochemical industry, safeguarding the normal operation of various systems.
Frequently Asked Questions
Q: What is the primary function of a check valve?
The primary function of a check valve is to prevent the back-flow of media in piping systems, ensuring safe, stable, and unidirectional operation.
Q: How does a swing check valve operate?
A swing check valve features a swingable disc. Forward media flow pushes the disc open. When the flow stops or reverses, gravity and backpressure force the disc to close, blocking reverse flow.
Q: What are the advantages of a double-disc check valve?
A double-disc check valve utilizes two semi-circular discs that close rapidly during reverse flow. This structure allows the valve to be compact, lightweight, and easy to install.
Q: What materials and sizes are available for these check valves?
These check valves are constructed from brass with rubber seals, and they are available in sizes ranging from DN50 to DN1200.
Q: Which standards do these brass check valves comply with?
They are manufactured in compliance with international standards including DIN, ANSI, GOST, JIS, and BS.
Q: In what applications are these check valves commonly used?
They are widely applied in water supply and drainage systems, as well as the petrochemical industry, to safeguard standard operations.