THERMALLY-SENSITIVE TRIGGERING MECHANISM FOR SELECTIVE MECHANICAL ENERGIZATION OF ANNULAR SEAL ELEMENT
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United States of America Patent
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Issued Date -
May 22, 2014
app pub date -
Nov 14, 2013
filing date -
Nov 16, 2012
priority date (Note) -
Abandoned
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Abstract
A seal assembly for use in a valve that maintains a seal during operational excursions of high temperature, such as during a fire. The seal assembly includes a eutectic material that retains an energizing element in place during normal conditions, which in turn keeps a secondary seal spaced axially away from a sealing position. During high temperature excursions, the eutectic material degrades and releases the energizing element. When released, the energizing element energizes a secondary seal that is in an annular space between a valve stem and valve housing.
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