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:
May. 22, 2012
Filed:
Jan. 06, 2009
Charles E. Jennings, Tomball, TX (US);
Charles E. Jennings, Tomball, TX (US);
Vetco Gray Inc., Houston, TX (US);
Abstract
A wellhead assembly includes a valve with a valve actuator. The valve actuator linearly moves a valve stem and valve member assembly to selectively open and close the valve. The valve actuator moves the valve stem by reciprocatingly moving a piston that is attached to the valve stem. The piston is moved by applying pressurized hydraulic fluid to a piston surface. Piston direction is controlled by a selector valve that selectively diverts a hydraulic flow to either side of the piston. The actuator further includes a piston assembly for pressurizing a hydraulic flow, where the piston assembly reciprocates in response to engagement by a profiled rotating cam member.