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butterfly damper[′bəd·ər‚flī ‚dam·pər]
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A valve used to control the flow of fluids; a disk controls flow through the port. Also called a butterfly damper.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.