Water type silencing check valve is flow-line designed and pressure loss is very little; the spring accelerates the valves closing and get silence effect; The metal-to-metal sealing ensures the positive reliability of sealing and this kind of valve needs small installation space. It is usually installed at the outlet of pump to prevent water-hammering, water hitting, destructive impact and backward flow and protects related equipments. It is widely used in the water-supplying-draining system, fire fighting system, construction, heat supplying and industry system etc.