Equalizing valve seat for a subsurface safety valve

Details Equalizing valve seat for a subsurface safety valve Equalizing valve seat for a subsurface safety valve

1996-02-08

1999-03-23

Neuder, William

Wells

Valves, closures or changeable restrictors

Fluid operated

1663327, 251332, 251333, E21B 3412

Patent

active

058847057

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).

REFERENCES:
patent: 3640501 (1972-02-01), Walton
patent: 4938376 (1990-07-01), Fieseler et al.
patent: 5172716 (1992-12-01), Pattern
patent: 5249600 (1993-10-01), Blume
patent: 5259590 (1993-11-01), Chambers
patent: 5503229 (1996-04-01), Hill, Jr. et al.

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