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:
Nov. 17, 1987
Filed:
Aug. 22, 1986
George W Brown, Garden Grove, CA (US);
Mark Controls Corporation, Skokie, IL (US);
Abstract
A gate valve includes a body which includes first and second valve seats. First and second gates are mounted for movement adjacent to the valve seats, and each of the gates has an outer face adapted to seal against the respective valve seat and an inner face which defines a thrust pad. A wedge is interposed between the first and second gates, and the wedge defines first and second converging wedge faces rigidly positioned with respect to one another to bear against the respective thrust pads. At least one of the thrust pads and the wedge faces defines a convex surface. A hand wheel axially moves the wedge with respect to the body and the wedge is coupled to the gates such that movement of the wedge away from the valve seats moves the gates away from the valve seats. The convex surface allows the respective gate to articulate with respect to the wedge as necessary to align with the valve seat. The wedge is coupled to an actuating member shaped to abut the gates, and springs are placed between the wedge and the gates to bias the gates into contact with the actuating member.