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:
Oct. 28, 1986
Filed:
Feb. 17, 1981
David E Snyder, Longview, TX (US);
Billy R Bruton, Longview, TX (US);
Axelson, Inc., Longview, TX (US);
Abstract
Disclosed is a heat sensitive jack for overriding a valve including a valve body and a gate valve member connected to a valve stem which is operated by a linear actuator having an actuator body and an actuator stem connected to the valve stem extending outwardly of the actuator body, wherein the actuator stem is movable between an open and a closed position, and wherein no hazardous projectiles are formed when the stem moves to the closed position. The jack includes a cap connectable to the body and a nut axially movably disposed in the cap for movement between a first position and a second position, wherein the distance between the first and second positions is at least as great as the distance between the open and closed positions of the valve. A fusible element is provided to normally maintain the nut in the first position, but which upon being exposed to excessive temperature will allow the nut to move to the second position within the cap. A jack screw is threadably engaged in an axially movable with respect to the nut and adapted to be moved into abuttment with the jack stem when the cap is connected to the actuator body to jack the stem toward the open position.