butter fly valve

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:
1860–65

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
butterfly valve
 
n
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

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