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Screw down non return valves only allow a liquid to be passed one way through it. Even when the valve is in open position valve lid is on the seat unless any liquid is pressurized from its inlet side.Any back flow will be restricted.

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Enos Reichel

Lvl 10
3y ago

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What is the symbols for a screw down valve?

symbol for screw down non return valve


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Screw down non return valves only allow a liquid to be passed one way through it. Even when the valve is in open position valve lid is on the seat unless any liquid is pressurized from its inlet side.Any back flow will be restricted.


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