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. 21, 1982
Filed:
Nov. 10, 1980
Applicant:
Inventor:
Clifford M Peters, Longview, TX (US);
Assignee:
W-K-M Wellhead Systems, Inc., Shreveport, LA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
F15B / ;
U.S. Cl.
CPC ...
137557 ; 137458 ; 13762566 ;
Abstract
A manually set relay valve (38) for controlling fluid flow to and from a valve actuator (14). A slide valve (60) is manually pulled outwardly to the set or open position and held therein by pilot pressure applied to a piston chamber (46) through a passage (110) in the slide valve (60). When the slide valve (60) is tripped to the closed position due to an interruption of pilot pressure, a cross port (112) of the fluid passage (110) vents the piston chamber (46) to maintain the relay (38) closed until manually reset.