| 摘要 |
A valve device mounted in an opening provided in the wall of a pressurized container comprises an outer cup-shaped member made of a resilient plastic and an inner cup-shaped member made of a rigid material and mounted as a force fit in the outer cup-shaped member. The outer cup-shaped member has a perforated bottom which carries an upwardly extending axial portion adapted to form the closure member of the device. Under the action of the resiliency of the outer cup-shaped member this closure member is engaged in gas-tight contact into a tubular seat portion carried by the bottom of the inner cup-shaped member. This seat portion has a perforatable upper wall adapted to be perforated by the needle of a gas-intake head. The needle depresses the closure member and thus opens the valve device. If the gas-intake head is accidentally removed, the closure member returns to the closed position and prevents any gas exhaust from the container. |
