butterfly valve noun
: a valve consisting of two semicircular clappers hinged to a cross rib that permits fluid flow in only one direction
: a damper or valve in a pipe consisting of a disk turning on a bisecting axis
First Known Use of BUTTERFLY VALVE
Learn More About BUTTERFLY VALVE
Seen & Heard
What made you want to look up butterfly valve? Please tell us where you read or heard it (including the quote, if possible).