1 butterfly valve | Definition of butterfly valve
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butterfly valve

noun

Definition of butterfly valve

1 : a valve consisting of two semicircular clappers hinged to a cross rib that permits fluid flow in only one direction
2 : a damper or valve in a pipe consisting of a disk turning on a bisecting axis

First Known Use of butterfly valve

1809, in the meaning defined at sense 1

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Britannica.com: Encyclopedia article about butterfly valve

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