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:
Apr. 02, 1985
Filed:
Sep. 26, 1983
Applicant:
Inventor:
Norman W Read, Dallas, TX (US);
Assignee:
Dresser Industries, Inc., Dallas, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166330 ; 251160 ; 251283 ; 251315 ;
Abstract
The valve includes a tubular housing member that is connected in a string of a tubing that extends into an oil or gas well. The upper end of the tubular housing member is rotatable and is connected through actuators to a valve member that is pivotally supported in the tubular housing member. Rotation of the upper end of the tubular housing causes the actuators to move linearly and in opposite directions simultaneously pivot the valve member between open and closed positions. Pressure responsive means bias the seat toward the valve to maintain a fluid tight seal regardless of the direction of differential in pressure existing across the valve.