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What are the commonly used check valves

Posted by Bundor valve
Check valve is an automatic valve, do not need manual operation, rely on the fluid medium pressure to achieve opening and closing;The purpose of the check valve is to prevent backflow of the fluid.There are many types of check valves, common check valves are:
check valve
Lifting check valve

The disc along the valve body vertical center line sliding check valve, lifting check valve can only be installed in the horizontal pipe, in the high pressure small diameter check valve disc can be used round ball.Lift check valves have the same body shape as globe valves (can be used with globe valves), so they have a greater fluid resistance coefficient.The structure is similar to the globe valve, the body and disc are the same as the globe valve.The upper part of the disc and the lower part of the cover are processed with guide sleeve. The guide sleeve of the disc can freely rise and fall in the guide sleeve of the valve. When the medium flows forward, the disc is opened by the medium thrust.Straight through lifting check valve medium inlet and outlet direction and valve seat direction vertical;Vertical lift check valve, its medium inlet and outlet channel direction and valve seat channel direction is the same, its flow resistance is less than straight through.

Swing check valve

The disc of swing check valve is disc-shaped, the rotation axis around the valve seat channel for rotary movement, because the valve channel into the flow line, flow resistance is smaller than the lifting check valve, suitable for low velocity and flow is not often changing large diameter occasions, but not for pulsating flow, its sealing performance is not as good as the lifting type.Swing type check valve is divided into single type, double type and half type three, the three forms are mainly divided by valve diameter, the purpose is to prevent the media stop flow or reverse flow, reduce the hydraulic impact.

Butterfly check valve

A check valve with the disc rotating around a pin shaft in the seat.Disc check valve simple structure, can only be installed in the horizontal pipe, poor sealing.

Pressure type check valve

This valve is used as boiler feed water and steam cut-off valve, it has the function of lifting check valve and globe valve or Angle valve.

Pipe check valve

A valve that slides along the centerline of the body.Pipeline type check valve is a new valve, its small size, light weight, good processing technology, is one of the development directions of check valve.But the fluid resistance coefficient is slightly larger than that of swing check valves.