Principles of valve opening and closing valve parts by medium flow and the forces to open or close the valve to prevent the media called the check back. Check valves are automatic valves, mainly for one-way flow of media channels, only allowing media to flow in one direction, to prevent accidents. Check valve according to the structure can be divided into lift check valve, swing check valve and butterfly valve of three. Lift check valve can be divided into two kinds of vertical and horizontal. Swing Check into unicuspid type, double valve type and Orange Peel three. Butterfly valve for the straight-through, the above check valve in the connection of several forms can be divided into threaded connection, flange connection and welding of three. Check valve is to automatically prevent fluid backflow valve. Check valves in the fluid under pressure valve opens, fluid flows from the inlet side of the exit side. When the import side, the pressure is lower than the export side, the valve flap in the fluid pressure, the role of such factors as gravity itself automatically close to prevent fluid backflow.

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