Wells – Valves – closures or changeable restrictors – Fluid operated
Patent
1990-10-01
1992-08-11
Neuder, William P.
Wells
Valves, closures or changeable restrictors
Fluid operated
251303, 251366, E21B 3410
Patent
active
051370891
ABSTRACT:
A subsurface safety valve has a valve seat and an upwardly closing flapper plate whose sealing surfaces each have a matched spherical radius of curvature. The sealing surface of the valve seat is a concave spherical segment and the sealing surface of the flapper plate is a convex spherical segment. The matching spherical surfaces are lapped together to provide a metal-to-metal seal along the interface between the nested convex and concave sealing surfaces. This permits angular displacement of the flapper plate relative to the valve seat without interrupting positive sealing engagement. The concave spherical seating surface of the safety valve seat will tolerate a limited amount of misalignment of the flapper plate which sometimes occurs during operation of the safety valve under high flow rate, high differential pressure conditions.
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Dickson Rennie L.
Hines Craig D.
Smith Roddie R.
Griggs Dennis T.
Neuder William P.
Otis Engineering Corporation
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