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Valve opening and closing pieces by medium flow and strength to turn itself on or off, in order to prevent the media back valve called a check valve. Check valves are automatic valves, mainly for the 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 valve can be divided into vertical and horizontal. Swing check valve into a single lobe, double valve type and Orange Peel three. Butterfly valve for the straight-through, more than a few non-return valve in the form of connection can be divided into threaded, flanged and welding three. Check valve is automatically prevent fluid backflow valve. Of check valve to open under fluid pressure, fluid flows from the inlet side of the outlet side. When the inlet side of the pressure lower than the export side, the valve under fluid pressure factors, such as gravity itself automatically shut down to prevent fluid backflow.

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