Dynamic seal assembly for piston and cylinder operating in subterranean wells
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United States of America Patent
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-
May 10, 1988
Grant Date -
N/A
app pub date -
Dec 16, 1985
filing date -
Dec 16, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A dynamic seal for effecting the sealing of a piston which is axially movable in a cylinder bore comprising a primary sealing element formed of a non-elastomeric sealing material having a hub portion secured to the piston element and an outwardly flaring skirt portion sealingly engagable with the cylinder bore. A secondary sealing element formed of a resilient metal has its central body portions secured to the piston element and defines a frustro-conical lip portion snugly engaging the exterior of the skirt portion of the primary seal element. Fluid pressure applied to the primary seal element causes it to expand the secondary seal element into a metal-to-metal sealing engagement with the bore of the cylinder.
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