Metering valves for dispensers
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United States of America Patent
Stats
-
Aug 16, 2011
Grant Date -
Oct 30, 2008
app pub date -
Aug 10, 2005
filing date -
Aug 11, 2004
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A metering valve is provided for a pressurised container containing a pharmaceutical formulation. The valve has a stem with a central flange and a hollow open end with a side port. The stem slides in a body having larger and smaller diameter portions, and being closed off by a seal against which the flange rests in an inoperative position. A second seal is located around the stem on the opposite side of the flange and trapped by a spring which urges the stem into its inoperative position. When the stem is depressed, the inner seal forms a sliding seal with the smaller diameter portion of the body to define a metering chamber filled with the pharmaceutical formulation. Continued depression opens the side hole to allow the contents of the metering chamber to be dispensed.
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