A Check Valve, Non Return Valve or a One way Valve is a valve that normally allows fluid (Liquid or Gas) to flow through only one direction. Check Valves are two port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. Check Valves work automatically and most are not controlled by a person or any external control, accordingly, they do not have any valve handle or stem. Check Valve Symbol on P&IDs. The Arrow shows the flow direction. Check Valves are automatic valves that open with forward flow and close with reverse flow. The pressure of the flow passing through the system opens the valve, while reversal of flow will close the valve. Types of Check Valves Swing Check Valve A basic Swing Check Valve consists of a Body, a Bonnet and a disc that is connected to a hinge. The disc swings away from the valve seat to allow flow in forward direction, and returns to the valve seat, when u...
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