Also found in: Dictionary, Acronyms.
air valve[′er ‚valv]
A valve that automatically lets air out of or into a liquid-carrying pipe when the internal pressure drops below atmospheric.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A valve used to admit or discharge air from a pipeline.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.