Patent ID: 7490811

Claim:
A diaphragm valve for compressed or liquefied gases, comprising a valve body which defines an inlet which can be associated with a pressurized gas cylinder and forms a gas outlet port, a closure port being provided between said inlet and said outlet port, a gasket acting on said closure port and being supported by a flow control element, which engages the internal face of a diaphragm which is directly engaged between the valve body and a ring-shaped protruding portion of a bush, on the outer face of said diaphragm there acts a pusher piston, which can be actuated by means of an external knob, and further comprising, between said diaphragm and said pusher piston, at least one metallic disk having a diameter that is less than the diameter of said diaphragm such that said at least one metallic disk is arranged inside said ring-shaped protruding portion.