noun Date: 1846 a valve consisting of two semicircular clappers hinged to a cross rib that permits fluid flow in only one direction, a damper or valve in a pipe consisting of a disk turning on a bisecting axis
BUTTERFLY VALVE
Meaning of BUTTERFLY VALVE in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012