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.

1830–40 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
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 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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Example sentences
A-The toilet probably has a leak between the tank and bowl, caused by a worn or
  defective ball valve or flapper valve.
Ball valve with integral thermal expansion relief valve.
The insert illustrates an example of a ball valve lockout device that can be
  used to lock out the pneumatic airline.
The actuated ball valve opens and resin is pumped in to the process tank until
  the desired weight is reached.
Image for ball valve
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