摘要：

A metering valve assembly (10) comprising a ferrule (8) and a valve housing (22) defining an internal cavity (24). The valve housing accommodates an annular flange (66) and a compression spring (28) therein with a valve gasket (30) closing the internal cavity. The valve housing is attached to the ferrule such that a stem portion (26) of the valve stem protrudes through apertures provided in both the valve gasket and the ferrule. A stem portion has a discharge passageway (50) which is normally closed by the valve gasket. Either an undersurface of the annular flange or a mating surface of the valve housing is provided with a compressible sealing member (68) while the other is provided with an annular edge (70). The compressible sealing member and the annular edge form a seal therebetween, when the valve stem is sufficiently depressed, to partition the interior cavity into a metering chamber (58) and a separate filling chamber (78) whereby product may only be dispensed solely from the metering chamber when a product flow path is established.

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