Patent ID: 6820778
Filing Date: 2004-11-23
Classification: B65D

Abstract:
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 a larger diameter portion 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 a smaller diameter portion of the valve pin at a second position that is relatively far from the center of the gas container; a metering chamber formed between the first seal ring and the second seal ring to trap a predetermined amount of gas prior to spraying; and a diameter gap between the larger diameter portion and the smaller diameter portion of the valve pin is used as a stopper face to restrict the raised position of the valve pin, 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 both first and second stop positions, 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 is positioned so that the bottom end of the gas valve is within metering chamber to a point on the outer periphery above the first seal ring only when the valve pin is in raised position so that communication between the interior of the gas container and the metering chamber is opened; and the smaller diameter portion of the valve pin is pushed into the interior of the gas container below the first ring, seal of the first seal ring is broken and the interior of the communication between the gas container and the metering chamber is opened.