butterfly valve

noun

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.

Origin of butterfly valve

First recorded in 1860–65

Words nearby butterfly valve

butterfly orchid, butterfly pea, butterfly rash, butterfly roof, butterfly table, butterfly valve, butterfly wedge, butterfly weed, butterfly-shell clam, butterflyfish, butterine

British Dictionary definitions for butterfly valve

butterfly valve

noun

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