ball-valve

ball valve

noun Machinery.
1.
a valve controlling flow by means of a ball pierced with an opening in one direction and fixed to rotate on a spindle at right angles to the opening.
2.
any valve that checks flow by the seating of a ball.

Origin:
1830–40

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
ball valve
 
n
a one-way valve consisting of a metal ball with a cylindrical hole fitting into a concave seat over an opening

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

ball valve n.
A valve regulated by the position of a free-floating ball that moves in response to fluid or mechanical pressure.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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