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. 02, 1986
Filed:
Apr. 27, 1983
Norman A Nelson, Houston, TX (US);
NL Industries, Inc., New York, NY (US);
Abstract
A gate valve, seat, and face seal therefor, the valve including a valve body defining a longitudinal flowway and a valve element mounted in the valve body and movable transverse to the flowway between open and closed positions. The valve seat mounted in the valve body includes a seat body having an axially facing annular contact face for opposition to the valve element and an annular groove extending axially thereinto, the annular groove in turn having inner and outer side walls. The face seal comprises an annular elastomeric seal body having a base portion disposed in the annular groove and a sealing portion which, in a relaxed condition, projects axially outwardly from the annular groove. The seal body further has an annular auxiliary sealing formation extending about its outer diameter and sealing engaging the outer side wall of the annular groove.