| 摘要 |
In a valve used for dispensing flowable product from a pressurized container A cup is snapped onto the button at the base of the valve stem so that the upper rim of the cup engages the resilient sealing grommet that surrounds the main portion of the stem. The upper rim of the cup provides a moderately sharp sealing edge so that the pressure against the surface of the resilient grommet is enhanced. This creates a more effective seal than does the relatively broad surface to surface engagement between button and grommet in a standard valve.
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