Slide ball type check valve, rubber cover ball for disc, in the action of the medium, can be in the body of the body slide up and down to scroll up and down. To open or close the valve, the sealing property is good, the silencing type is closed, no water hammer is produced. Body adopts the whole flow passage, large flow, small resistance, the head loss is 50% less than swing, horizontal or vertical installation, can be used to the cold water, hot water, industrial and living sewage pipe network, and is more suitable for diving sewage pump, medium temperature is O ~ 80 ℃.