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ball valve
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    Also found in: Dictionary/thesaurus, Medical, Encyclopedia, Wikipedia 0.01 sec.

ball valve

Valve that works by the action of external pressure raising a ball and thereby opening a hole.

An example is the valve used in toilet water tanks to cut off the water supply when it reaches the correct level. It consists of a flat rubber washer at one end of a pivoting arm and a hollow ball at the other. The ball floats on the water surface, rising as the tank fills, and at the correct level the rubber washer is pushed against the water-inlet pipe, cutting off the flow.



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