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ball valve

noun, Machinery.
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.
any valve that checks flow by the seating of a ball.
Origin of ball valve
1830-40 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for ball-valve

ball valve

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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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ball-valve in Medicine

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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