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ball valve

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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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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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® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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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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