Check Valve (One-way valve): Check valves, also known as a one-way valve or check valve, whose role is to prevent the media back in the pipeline. Pump water off the end of the valve a check valve class. 
 Opening and closing pieces by medium flow and strength of its own open or closed, to prevent flow reversal valve is called non-return valve. Check valves are automatic valves, mainly used in pipes of medium flow in one direction, only allowing media to flow in one direction to prevent accidents 
 The check valve (one-way valve): automatically prevents fluid backflow valve. The check valve in the fluid under pressure to open, fluid flows from the inlet side of the exit side. When the inlet side of the pressure is lower than the export side of the flap valve in the fluid pressure, gravity itself and other factors automatically close to prevent fluid backflow. 
 Check Valve (One-way valve): generally divided into the lift, swing, butterfly and diaphragm are several types. 
 Lift check valve structure generally similar to the cut-off valve, the valve to the line along the channel for the lifting movement, action, fluid resistance, light and small caliber occasions. Lift check valve can be straight and vertical. Straight-through lift check valve generally only be installed in a horizontal pipe, vertical lift check valve installed in a vertical pipe. 
 The swing check valve around the shaft for rotation. The fluid resistance is generally less than the lift check valve, it applies to a larger caliber occasions. Swing check valves can be divided into the number of valve the univalve swing, double disc swing and Orange Peel Swing three kinds. Univalve Swing check valves are generally applicable to medium-caliber occasions. Large-diameter pipe selection the univalve swing check valve to reduce water hammer pressure, it is best to use the slow closing check valve to reduce the water hammer pressure. The double disc swing check valve for medium and large diameter piping. Folder double disc swing check valve structure of small, light weight. Is a development of a faster check valve; Orange Peel Swing Check Valve in large diameter pipe. 
 The structure of the butterfly valve is similar to the butterfly valve. Its simple structure, small flow resistance, and water hammer pressure is also small. 
 Diaphragm check valves have a variety of structural forms, using the diaphragm as opening and closing parts due to water hammer performance, simple structure, low cost, rapid development in recent years. However, the use of temperature and pressure of the diaphragm valve diaphragm material constraints. 
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