Our product  type HX42X  HC42T quiet sound check valve constitute by valve body. Valve seat, lead flowing substance, valve petal, axle bush and the spring ect. The inside flowing way adopt stremline design, pressure wast is very small, the route of the valve petal turn on or off is short. When stop the valve, it's can quickly shut off, prevent huge noise of the water hammer. So that can have the quiet sound effect.This valve primarily be used of catch ment drain of water, fight fire, warm tharoughfare system, It can install at the eit of the pump. To prevent the material flow backwards and the destory from the water hammer to the pump.