A check valve is a plumbing device designed to allow water and/or gas to flow freely through a pipe in one direction while preventing it from flowing back in the opposite direction. Check valves feature one of two mechanisms: a spring-loaded ball or a plastic or metal flap attached to the valve with a hinge. In both cases, the oncoming water/gas pushes the valve's obstacle out of the way and flows around it through the pipe. If the water tries to flow in the opposite direction, the force jams the flap/ball into the valve, sealing off the pipe.

More products of valves

Globe Valves

Safety valves

Plug Valves

Reducing Valves

Balance Valves