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:
Feb. 03, 1998
Filed:
Aug. 24, 1995
Michael E Wilson, Jr, Spring, TX (US);
Roy C Bates, Crosby, TX (US);
FMC Corporation, Chicago, IL (US);
Abstract
The present invention is directed to a check valve assembly comprising an upstream body member and a downstream body member which are joined in sealing engagement to thereby form a closed body; a generally ring-shaped seating member formed from a unitary piece of material and comprising a flat base surface positioned in said closed body with said flat base surface facing upstream, a flat top surface parallel to said flat base surface, a flow passage extending from said base surface to said top surface and a bore extending into said top surface toward said base surface, said bore defining an annular lip surrounding said flow passage and a recessed upward-angled planar top sealing surface; said seating member further comprising a cut-out segment formed in said lip which defines two extensions projecting axially from the top sealing surface and a transverse hole in each extension through which a hinge pin is received to connect a movable flapper lid to said seating member; said flapper lid comprising a flapper sealing surface adapted to sealingly engage the top sealing surface of the seating member to stop backflow when said regular flow pressure from upstream drops to a predetermined level causing the flapper to rest in the closed position,