Adjustable loss-of-head valve

摘要

An adjustable loss-of-head valve with a mobile perforated plate sliding on a stationary perforated plate, constituted by an annular one-piece body comprising an annular constriction on the upstream side with an annular recess immediately downstream from said constriction and in which a mobile perforated plate moves, a stationary perforated plate being disposed in the downstream part of this recess, the assembly formed by the body and the stationary plate being clamped between two flanges of a pipe on which said loss-of-head valve is placed.