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:
Mar. 23, 1999
Filed:
Feb. 08, 1996
Thomas G Hill, Jr, Kingwood, TX (US);
Camco International Inc., Houston, TX (US);
Abstract
An equalizing subsurface safety valve for controlling fluid flow in a well conduit has a tubular body member with a longitudinal bore extending therethrough, and a flapper hingably connected within the tubular body member to alternately permit and prevent fluid flow through the longitudinal bore. The flapper is biased to a normally closed position to prevent fluid flow through the longitudinal bore. A fluid passage is provided for fluid communication between the longitudinal bore adjacent a first side of the flapper when the flapper is in a closed position and a second side of the closed flapper. A valve closure member is mounted across the fluid passage adjacent the first side of the flapper and is movable along an axis generally transverse to the longitudinal bore, and abuts a valve seat assembly. The valve seat assembly comprises a first annular sealing surface and a second annular sealing surface arranged so that when the closure member is moved to a closed position an annular sealing surface thereon contacts the first annular sealing surface before contacting the second annular sealing surface. The first annular sealing surface is formed from a material of lesser hardness than the second annular sealing surface, such as polyetheretherketone (PEEK).