In the pump stops, the valve closing process to complete its own weight

Check valve is an effective way to prevent fluid backflow prevent reverse impeller pump runaway protection device, it is widely used in industrial agricultural production. Currently used mostly for hanging flap check valve check valve, no external  Instrument needle valves . In the pump stops, the valve closing process to complete its own weight. It is characterized by simple, inexpensive, back flow is small. Its  2 way manifolds  off valve water hammer bigger. This is reflected in two aspects: one is a sudden when the pump stops, the valve began to move, when you close to a relatively small opening, the fluid backflow may occur, under the impact of the liquid in the back, there will be a sudden closure of the valve process, resulting in a direct water hammer.