Patent ID: 6263519
Filing Date: 2001-07-24
Classification: E03D

Abstract:
A flusher comprising:A) a tank forming a flush outlet by which liquid in the tank may leave the tank for flushing;B) a flush-valve member biased to an unseated state, in which it permits flow from the tank through the flush outlet, and operable between its unseated state and a seated state, in which it prevents flow from the tank therethrough;C) a flush-valve housing that forms a flush-valve chamber in which at least a portion of the flush-valve member is movably disposed, the flush-valve housing further forming a flush-valve chamber pressure-relief outlet and a line-pressure inlet that so admits water line pressure into the flush-valve chamber as to keep the valve in its seated state when water line pressure above a minimum hold pressure prevails in the flush-valve chamber; andD) a pressure-relief mechanism operable between a closed state, in which it prevents relief of flush-valve-chamber pressure through the flush-valve chamber pressure-relief outlet, and an open state, in which it relieves flush-valve-chamber pressure through the flush-valve chamber pressure-relief outlet.