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Related to ball valve: Plug valve
A valve regulated by the position of a free-floating ball that moves in response to fluid or mechanical pressure.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Mechanical Engineering) 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 and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a plumbing valve that regulates the flow of a fluid by means of a ball that moves into or out of the valve opening.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.