Patent ID: 6871799

Claim:
A gas spray valve, comprising a valve case secured to an opening portion of a gas container; a valve pin slidably received in the valve case; a first seal ring and a second seal ring arranged within the valve case, the first seal ring coming into close contact with an outer periphery of the valve pin at a first position that is relatively close to the center of the gas container, the second seal ring coming into close contact with the outer periphery of the valve pin at a second position that is relatively far from the center of the gas container; and a metering chamber formed between the first seal ring and the second seal ring to trap a predetermined amount of gas prior to spraying, the gas spray valve wherein, the valve pin includes a gas conduit extending therethrough from a top end thereof that is positioned outside the gas container to a point on an outer periphery thereof that is axially apart from the top end, with an opening of the gas conduit on the outer periphery of the valve pin being arranged such that it is positioned above the second seal ring when the valve pin is in its raised position, it is positioned below the second seal ring within the metering chamber when the valve pin is pushed into a first stop position, and it is positioned below the first seal ring within the gas container when the valve pin is pushed into a second stop position; the valve pin further includes a gas supply passage extending from a bottom end thereof that is positioned within the gas container to a point on the outer periphery that is axially apart from the bottom end, an opening of the gas supply passage on the outer periphery of the valve pin being arranged such that, when the valve pin is in the raised position, it is positioned above the first seal ring within the metering chamber to open communication between the interior of the gas container and the metering chamber.