A check valve is a type of valve that automatically opens and closes the valve disc based on the flow of the medium itself to prevent the backflow of the medium. It is also known as an anti-reflux valve, a one-way valve, an anti-flow valve, and a back-pressure valve. It belongs to an automatic valve. The flanged check valve is designed and installed between flanges and is suitable for various fluids in process pipelines, hot water systems, steam and condensate water systems, etc. Note: The flanged check valve is not suitable for occasions with severe pulsation, such as the outlet of compressors.
Q: What is the purpose of a check valve in a steam system?
A: It permits fluid flow in only one direction, preventing dangerous medium backflow into boilers or tracing lines.
Q: Where are check valves located in a condensate loop?
A: Typically installed directly after a steam trap’s discharge outlet to prevent backpressure from forcing condensate back into the trap.
Q: What causes check valve chattering in steam applications?
A: Chattering is caused by an over-sized check valve or low flow velocities, which fail to hold the internal valve disc stable.
Q: Can a wafer check valve be used for high-pressure steam?
A: Yes, wafer check valves are compact, lightweight, and engineered in cast steel or stainless steel to handle high-pressure headers.
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