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:
Sep. 18, 1984
Filed:
Jan. 27, 1982
Norman A Nelson, Houston, TX (US);
NL Industries, Inc., New York, NY (US);
Abstract
A gate valve and seat 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. A valve seat is mounted in the valve body for limited axial floating movement with respect to the valve body, the seat comprising a seat body having a generally axially facing contact face for engagement with one side of the valve element. The contact face has an annular groove therein intermediate its radially inner and outer extremities, and the seat body further has at least one vent communicating with the annular groove and extending outwardly therefrom to the radially outer extremity of the seat body.