| 摘要 |
In a pressure vessel containing fluid or pasty product and equipped with a manually operable discharge valve spring-biased to a closed position, dispensing means for allowing a metered amount of said product to reach said discharge valve on operation thereof comprise a housing defining a metering chamber which is closed by a flexible diaphragm and can communicate with the discharge valve by way of a connecting passage. Further valve means disposed between the vessel interior and the metering chamber are adapted to be closed when the discharge valve is opened to expel the metering chamber contents and to be opened for replenishing the metering chamber when the discharge valve is closed.
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