Pilot valve with fusible lockout knob

Details Pilot valve with fusible lockout knob Pilot valve with fusible lockout knob

1982-03-29

1984-09-04

Weakley, Harold W.

Fluid handling

Destructible or deformable element controlled

Heat destructible or fusible

137 77, 137553, 13762566, 251109, F16K 1304

Patent

active

044691190

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.

REFERENCES:
patent: 1251489 (1918-01-01), Essen
patent: 1891183 (1932-12-01), Aowley
patent: 3015337 (1962-01-01), Hookway
patent: 4355658 (1982-10-01), Snyder

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