Pilot valve with fusible lockout knob
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United States of America Patent
Stats
-
Sep 4, 1984
Grant Date -
N/A
app pub date -
Mar 29, 1982
filing date -
Mar 29, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
There is disclosed an apparatus for manually locking a pilot valve in an 'in service' position independent of an actuating, or pilot fluid pressure. The apparatus may be either manually disengaged or will be automatically disengaged whenever the ambient temperature exceeds a predetermined level. The device includes a valve manipulating knob attached to the exterior end of a valving element for manually shifting the element from a normally closed position to the in service position. The knob includes an 'L' shaped locking member which conforms to the contour of the knob, and is adapted to pivot towards the valve body and lock the valving element out in the 'in service' position. This pivotal member includes an indicating surface visible from the front when the valving element is locked in an 'in service' position. The locking member is comprised of a fusible material selected to yield at a predetermined temperature so as to return the valve to an operating mode responsive to the pilot fluid pressure.
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