Non Return Valves

Non return valves allow the fluid to flow only in one desired direction. Any flow in the opposite direction is mechanically restricted from occurring. A non-return valve is fitted to ensure that a medium flows through a pipe in the right direction, where pressure conditions may otherwise cause reversed flow.

Non return valves are used to prevent back flow of fluid, which could damage equipment or upset the process. Such valves are especially useful in protecting a pump in liquid applications or a compressor in gas applications from back flow when the pump or compressor is shut down. Non return valves are also used in process systems that have varying pressures, which must be kept separate.

All check valves are non return valves.

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