Check Valve Series is a vital one-way flow control valve designed to prevent fluid backflow automatically, requiring no manual or actuator operation. It opens when forward fluid pressure exceeds a certain threshold and closes via gravity, spring force, or reverse pressure, ensuring unidirectional flow. Its core components include valve body, disc, seat, and optional spring. Common types are swing check and lift check valves—swing check for large flow rates, lift check for high-pressure applications. Simple in structure and highly reliable, it is widely applied in water treatment, petroleum, chemical, and power industries to protect pumps and pipeline systems. Potential issues like water hammer can be alleviated by proper model selection and installation.