The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 04, 1984
Filed:
Mar. 29, 1982
David E Snyder, Longview, TX (US);
Don Hiller, Midland, TX (US);
Axelson, Inc., Longview, TX (US);
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.