Patent ID: 6467750
Filing Date: 2002-10-22
Classification: F16K

Abstract:
A flexible diaphragm positioned between an inlet connection and an outlet connection of a flush valve, the outlet connection receiving a pressurized fluid which acts on the flexible diaphragm to move the flexible diaphragm from an unflexed state to a flexed state, the flexible diaphragm comprising:a body having a first low pressure side, a second high pressure side which contacts the pressurized fluid, and further defining an axially-extending passageway which extends from the first low pressure side to the second high pressure side, and an axially-extending bypass orifice which also extends from the first low pressure side of the body to the second high pressure side of the body, wherein the bypass orifice is spaced away from the passageway, and the bypass orifice has a variable diameter when the flexible diaphragm is in both the unflexed state and the flexed state, and wherein the second high pressure side of the body is concave and the first low pressure side of the body is convex when the pressurized fluid creates a pressure difference across the body.