Patent ID: 8434733

Claim:
A valve closure member adapted to seal with a valve seat of a valve in use, wherein the valve is used in the control of pressurised air from a pressure tank, the pressure tank including a wall in which an outlet port is formed, the wall having an inner surface and an outer surface, comprising, a piston disc and a valve closure disc, the discs held coaxially together by a spindle, the spindle having a diameter that is less than a diameter of the piston disc and the valve closure disc, the piston disc having a recess extending around its peripheral edge, the piston disc further having a bleed passage running from a top surface of the piston disc to a lateral surface of the spindle; and the valve closure disc having a peripheral surface for maintaining the valve closure disc aligned with a valve seat in use wherein the valve includes: a valve body of generally cylindrical configuration which defines an inner end which in use is located inside the pressure tank, and an outer end which in use is located outside of the tank; a flow passage extending through the valve body, the flow passage having an inlet at or adjacent the inner end of the body and an outlet at or adjacent the outer end of the body; a cylinder coaxially mounted to the valve body or formed thereon on the inner end of the valve body wherein the valve seat surrounds the flow passage; wherein the valve closure member is movable towards and away from the valve seat to close and open the valve respectively; and operating means for moving the valve closure member in order to operate the valve.