Dynamic backup ring assembly
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United States of America Patent
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Aug 30, 2016
Grant Date -
Feb 6, 2014
app pub date -
Oct 11, 2013
filing date -
Nov 30, 2009
priority date (Note) -
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Abstract
A seal backup ring assembly is provided that eliminates fluid differential pressure acting radially on the backup ring, preventing collapse of the backup ring against a shaft. The backup ring is assembled so that the initial clearance (extrusion gap) between the backup ring and relatively rotating member is not affected by the differential pressure acting across the assembly. This allows for an initially small extrusion gap to be present throughout the differential pressure range.
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