Check valve is a device that allows the flow of fluids to move only in one direction, the primary purpose is prevent backflow in the system. This valve opens when the pressure at the inlet exceeds the outlet pressure. A gradual rate of opening prevents sudden opening surges. SHSUOTE is the best check valve supplier in China,check flow valve can ensure gasses or liquids are flowing in the right direction, and create tight seals to prevent leaks. When a pressure reversal occurs the higher downstream pressure is applied to the cover chamber through the control tube lines, and the valve closes drip tight. Our check valve also is a hydraulically operated No-slam check valve. As a leading check valve manufacturer since 2004, our hydraulic check control valves adopted rubber disc assures tight sealing, they are ideally suited for use where a positive shutoff is required. The velocity of Open/Shutoff can be controlled by the ball valve on the outlet control tube line. SHSUOTE also support custom check valve, please contact us now!