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. 19, 1988
Filed:
Dec. 18, 1986
Donald H Perkins, Carrollton, TX (US);
Otis Engineering Corporation, Dallas, TX (US);
Abstract
Disclosed is an improved ball valve structure and a well safety valve utilizing the improved ball valve. The improved valve includes a metal seat member having a resilient section and control arms, which may be positioned to initially sealingly engage the seat with the ball and to compress the seat resilient section to control the force sealingly engaging the seat with the metal ball and thereby limit frictional forces opposing opening rotational forces when pushing on the seat to open the valve. The control arms are positioned by rings threaded on the seat above the control arms and below a shoulder in each arm. When the seat is moved down to open the ball valve, opening rotational forces are imparted to the valve ball through both the seat and control arms. The well safety valve utilizing the improved ball valve structure includes an annular metal valve and means increasing the force sealingly engaging the seat with the valve ball as pressure below the closed ball valve increases.