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Check Valve
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A check valve is a one way pass valve only. It lets the gas/liquid flow in one direction. If the pressure of the gas/liquid gets lower on the supply side, than delivery side, the check valve will automatically seal of the opening with a Ball/Flapper
which has bigger diameter than the opening.
The ball/Flapper will now be forced into the seal seat by the pressure of the medium trying to return.

Ball.

Flapper.
external image Check_Valve_Diagram.jpg
Symbols:
external image poppet-type-check-valves-2.jpg
other symbols used:
external image Pt2DiodeSymbol.jpg
Other.

external image h1018v2_55_1.jpg

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