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air valve

noun
1.
a device for controlling the flow of air, as from a pipe or tank.
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Based on the Random House Dictionary, © Random House, Inc. 2016.
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British Dictionary definitions for air-valve

air valve

noun
1.
a device for controlling the flow of air in a pipe
2.
a valve for exhausting air from a fluid system, esp from a central-heating installation See also bleed valve
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
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