- a device for controlling the flow of air, as from a pipe or tank.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for air valve
It was the kind of door that shuts with an air-valve, and it closed gradually, tranquilly, like velvet; a perfect lady of a door.Life's Minor Collisions
He stopped the engines, opened the air-valve, and the great ship instantly began to settle quietly down.With Airship and Submarine
The professor opened the air-valve and the ship at once began to settle down.The Log of the Flying Fish
If now the air-valve be opened very slightly, an internal cone of the same blue colour makes its appearance.
- a device for controlling the flow of air in a pipe
- a valve for exhausting air from a fluid system, esp from a central-heating installationSee 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