Valve activation assembly which mechanically collapses a collapsible member in response to both overpressure and underpressure conditions
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United States of America Patent
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May 13, 2008
Grant Date -
Apr 10, 2008
app pub date -
Oct 6, 2006
filing date -
Oct 6, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A valve activation assembly which mechanically collapses a collapsible member, such as a buckling pin, in response to both overpressure and underpressure conditions of a pressurized fluid. A retention member retains the valve member in a selected position with respect to the fluid, such as an open or closed position. A piston assembly is configured to mechanically collapse the collapsible member both when a fluidic pressure upon the piston assembly exceeds a first level, and when a fluidic pressure upon the piston assembly falls below a second level. Upon collapse of the collapsible member, the valve member releases the valve member, allowing the valve member to move to a different selected position (such as closed or open, respectively). A third piston member and a biasing member thereon can also be utilized. In some embodiments, a fluid is preferably held in compression between selected piston members.
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