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ball valve
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    Also found in: Dictionary/thesaurus, Medical, Wikipedia 0.11 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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The system also uses a unique temperature-profiled vacuum calibrator (supplied by the customer) with hot water introduced via 20 ball valves from the heated reservoir and chilled water from another 20 ball valves, allowing its temperature to be controlled separately from the cooling tanks.
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