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:
Dec. 03, 1985
Filed:
Apr. 18, 1983
Applicant:
Inventor:
Charles D Bridges, Houston, TX (US);
Assignee:
Gray Tool Comany, Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16K / ; F16K / ;
U.S. Cl.
CPC ...
137 72 ; 251214 ; 251330 ;
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).