Check valve is a valve that its opening and closing part relies on the medium flow and force to move, precluding the back flow of the medium.As one of automatic valves, check valve mainly used for one-way flow of media on the pipeline, allowing the media to flow in one direction only.The fluid under pressure makes the valve flap open and flow from the inlet side to the outlet side. When the pressure on the inlet side is lower than the outlet side, the valve flap automatically closes under the action of fluid pressure an

Check valve according to its structural characteristics can be divided into WAFER check valve, lift check valve, swing check valve, counter weight check valve, etc.

WAFER check valve

1. Compared with swing check valve, the flow resistance is large,Wafer check valve is not suitable for the outlet of high pressure (Class900 and above) pumps and compressor; not suitable for pulsating media conditions;not suitable for oxygen conditions.

2. Because it’s Structure of WAFER,Wafer check valve is not suitable for large diameter (DN600 or more), high pressure (Class900 and above) occasions.

3. Wafer check valve should as far as possibleinstalledhorizontally. In case of vertical pipeline, make sure the media flowfrom top to below.

Lift check valve

1. Subject by the working principle,lift check valve can only be installed in the horizontal pipeline.

2. Compared with the swing check valve,its flow resistance is large,lift check valve is not suitable for large diameter (DN50 and above) occasions, in general,it’s suitable for DN40 and smaller application.

Swing check valve

1.  Swing check valve should as far as possible installed horizontally. In case of vertical pipeline, make sure the media flow from top to below.

2.  limited by the structure,swing check valve should not be used for DN40 and below on the pipeline.

3. For large diameter pipelines (e.g. DN400 and above), Tilting swing check valves are recommended.

Counter weight check valve

1. Choose according to needs

2. Counter weight check valveis used inwhere serious water hammer may occur.