Valve assembly with annular sealing member having elongated-circle cross-sectional shape
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United States of America Patent
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Nov 12, 2013
Grant Date -
Nov 10, 2011
app pub date -
Jul 19, 2011
filing date -
Jun 1, 2007
priority date (Note) -
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Abstract
Apparatus for controlling a pressurized fluid. In accordance with some embodiments, a valve assembly includes a piston moved between closed and open positions. A sealing member is disposed within an annular recess of the piston and characterized as an endless annular ring extending about a central axis of the piston. The sealing member has an elongated circle cross-sectional shape when the sealing member is in an uncompressed state prior to installation in said recess. The cross-sectional shape is defined by parallel top and bottom surfaces having a length L in a direction perpendicular to and intersecting the central axis, and having opposing inner and outer surfaces of a radius R, the inner and outer surfaces respectively facing toward and facing away from the central axis, and wherein the dimensional value of L is at least five times greater than the dimensional value of R.
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