Function: noun
Date: 1846
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
Function: noun
Date: 1846
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
Merriam Webster Collegiate English Dictionary. Merriam Webster - Энциклопедический словарь английского языка. 2012