Patent ID: 6263908
Filing Date: 2001-07-24
Classification: F16K,F23N,Y10T

Abstract:
An improved slow opening gas valve, the gas valve of the type having an inlet, an outlet, a valve seat, a normally closed valve member operable between a closed position in which the valve member is seated in the seat blocking flow through the seat and an open position in which the valve member is spaced from the seat and allows flow through the valve seat, and a diaphragm forming a movable wall of an expansible control chamber, the diaphragm operable upon expansion of the expansible control chamber to move the valve member to the open position, the improvement comprising an expansible auxiliary chamber connected to the expansible control chamber by a metering orifice to control the expansion of the expansible control chamber and thereby control the opening of the gas valve, with the expansible control chamber in fluid communication with the inlet and outlet.