Silence check valve consists of valve body, seat, diversion shuttle, disc, bearing and spring etc.. The bore is flow-line designed so pressure loss is very little. The disc's stroke is very short and when stop the pump the valve can close quickly and prevent the great noise from water-hammering so the valve can close quietly without any noise .It is widely used in feeding/draining system, fire protection and heat supplying system, and it is installed at the outlet of the pump to prevent backward fluid's and water-hammering's damage to the pump.