| 摘要 |
There is described an improved aerosol dispensing metering valve. The valve, for use with a container for pressurized material comprises a valve body with a single internal metering chamber and outer and inner seals closing the respective outer and inner ends thereof. A valve member co-operating with the seals is movable between an inoperative position, in which the chamber is isolated from the atmosphere while the chamber communicates with the interior of the container, and an operative position in which the contents of the chamber can be discharged to the atmosphere while the chamber is isolated from the interior of the container. The valve member is provided with a lower portion adapted to slidably engage the inner seal when the valve is in the inoperative position, the lower portion being provided with means for communicating between the metering chamber and the interior of the container, the means being of sufficient size to allow the exit of air trapped in the chamber and to permit the entry of pressurized material in to the chamber when the valve is in the inoperative position. |
