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

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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

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Irrigation in the downstream direction with a normally open butterfly valve is preferred.
The butterfly valve should be sizes specifically for flow control at the filtration rate.
Remove float type overflow on deaerator and replace with butterfly valve and conductivity probe.
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