- 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
First recorded in 1830–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for ball valve
When the pressure falls again, the ball-valve is lowered and more gas passes through.
The ball-valve is supported by a suspension thread (T) from the roof of the bell (B).
At o is a delivery valve, opening outwards, which is often a ball-valve but sometimes a flap-valve.
The ball-valve ensures that while air can be sucked from both sides of the piston, it can be admitted to the lower side only.How it Works
Should the pressure increase, the bell (B) is raised and with it the ball-valve (V).
- 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
- 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.