Micro resistance slow close check valve used for water supply and drainage pipeline, installed in the pump outlet to prevent medium counter-current and eliminate the destructive water hammer, and can effectively reduce the water hammer pressure valve is closed, can guarantee the safe operation of the network. It has light disc, opening, energy-saving effect is remarkable, fluid resistance small, water hammer removing mechanism design is novel, stable and reliable sealing performance, wear resistance, long service life, smooth operation, no vibration, no noise, etc.