Definitions for ball valve
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Random House Webster's College Dictionary
ball′ valve`(n.)
a plumbing valve that regulates the flow of a fluid by means of a ball that moves into or out of the valve opening.
Category: Machinery
Origin of ball valve:
1830–40
Princeton's WordNet
ball valve(noun)
any valve that checks flow by the seating of a ball
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"ball valve." Definitions.net. STANDS4 LLC, 2013. Web. 26 May 2013. <http://www.definitions.net/definition/ball valve>.

