butter-fly valve

butterfly valve

a clack valve having two flaps with a common hinge.
a valve, as the throttle valve in a carburetor, that swings about a central axis across its face.


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World English Dictionary
butterfly valve
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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