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100checkvalve

Valve, Check

A check valve is a mechanical device used as an industrial or plumbing fitting, which normally allows fluid or gas to flow through it in only 'one' direction. A check valve is often used to prevent back flow and to keep potentially contaminated water from siphoning back into the system. Clapper valves, a type of check valve is used in or with firefighting, and has a hinged gate (often with a spring urging it shut) that only remains open in the outflowing direction.


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thumb|300px|right|How it works

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