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butterfly valve

noun
1.
a clack valve having two flaps with a common hinge.
2.
a valve, as the throttle valve in a carburetor, that swings about a central axis across its face.
Origin
1860-1865
1860-65
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for butter fly valve

butterfly valve

noun
1.
a disc that acts as a valve by turning about a diameter, esp one used as the throttle valve in a carburettor
2.
a non-return valve consisting of two semicircular plates hinged about a common central spindle
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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