| 摘要 |
A nonrefillable valve is especially adapted for an initial charge or fill of a pressurized container, and selective discharge of the container, but prevents subsequent refill of the container. The valve is characterized by a valve body which receives a valve operating assembly. The valve operating assembly includes a valve stem which is raised or lowered within the chamber of the valve, and a valve core which is slidably received in the distal end of the valve stem. In a first or pre-position, the valve core resides above a rim or protrusion within the chamber. After filling of the container, the valve stem is operated to force the valve core beyond the protrusion, and in seating engagement with a valve seat thus sealing the container. A second or closed position of the valve is defined when the valve stem forces the valve core against the valve seat. The valve is then selectively operated in a third or open position to discharge the container as desired. Subsequent refill of the container is prevented by the force of fluid reentering the valve which forces the valve core to its seated engagement with the valve seat, even when the valve is in the open position.
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