Check Valve （cheek valve）: also known as one-way valve or check valve, check valve, and its role is to prevent the line of medium back. Pump water off the end of the valve also belong to the class of non-return valve.
Opening and closing pieces by medium flow and forces to open or close the valve in order to prevent the media back called valve. Check valves are automatic valves, primarily for one-way flow of media channels, only allowing media to flow in one direction, in order to prevent accidents.
Check valve according to the structure can be divided into lift check valve, swing check valve and butterfly valve three. Lift check valves can be divided into vertical and horizontal. Swing check valves are divided into single lobe type, double disc type and Orange Peel three. Butterfly valve for the straight-through, more than a few non-return valve in the connection form can be divided into threaded, flanged and welded three.
Check valve shall be installed in the top note of the following things: 1, the check valve in the pipeline do not bear the weight of a large check valve should be **** support, so that the pressure generated from piping system effects. 2, the installation should pay attention to the direction of medium flow with the body of the votes in the arrow direction. 3, the vertical lift flap check valve should be installed in a vertical pipe. 4, the level of valve lift check valve should be installed in horizontal pipelines.