Fire resistant valve
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United States of America Patent
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-
Dec 3, 1985
Grant Date -
N/A
app pub date -
Apr 18, 1983
filing date -
Apr 18, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A normally non-rising stem valve having a valve stem (30) journaled between bearings (38, 40) is equipped with an energized drive spring (56) for positively engaging backseat seal surfaces (64, 66) upon melting of a fusible ring (52). The spring (56) is compressed axially against the retainer (46) by the cooperative action of the compression nut (58) and the tubular spacer (50), thereby normally avoiding undesirable axial thrust on the bearings (38, 40).
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