The valve by the medium pressure, normal or abnormal stop the pump, by the disc and the medium back pressure and push the valve disc, first quickly close most of the stroke, and then use the damping of the buffer device, slow down the rest, to prevent the destructive water hammer and participate in controlling the valve of the reverse speed of the pump. Generally installed in the pump mouth, the main function is to prevent the medium backflow, prevent the pump and its drive motor reversal, effectively solve the impact of the pipeline system, as well as the discharge of the medium in the container, is widely used in water purification, source water, sewage, sea water and other medium supply and drainage system.
