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ball valve

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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.
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Origin of ball valve

First recorded in 1830–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for ball valve

ball valve

noun
  1. a one-way valve consisting of a metal ball with a cylindrical hole fitting into a concave seat over an opening
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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

ball valve in Medicine

ball valve

n.
  1. A valve regulated by the position of a free-floating ball that moves in response to fluid or mechanical pressure.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.