Flow tube for use in an equalizing subsurface safety valve

Wells – Valves – closures or changeable restrictors – Fluid operated

Patent

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Details

1663327, E21B 3412

Patent

active

057525692

ABSTRACT:
An equalizing subsurface safety valve for controlling fluid flow in a well conduit comprises a tubular body member having a longitudinal bore extending therethrough, a flapper hingably connected within the tubular body member to alternately permit and prevent fluid flow through the longitudinal bore, means for biasing the flapper to a normally closed position to prevent fluid flow through the longitudinal bore, a flow tube longitudinally movable within the longitudinal bore for controllably opening the flapper, fluid passage formed within the tubular body for providing fluid communication between the longitudinal bore adjacent a first side of the flapper and a second side of the flapper, and a closure member mounted across the fluid passage adjacent the first side of the flapper and movable along an axis generally transverse to the longitudinal bore. A side wall of the flow tube includes a first notch so that the closure member is maintained in a closed position when the flow tube is in a retracted position and the closure member is moved to an open position when the flow tube is moved to open the flapper. A second notch can be included in the flow tube so that the closure member will return to a closed position when the flow tube is extended to a position where the flapper is opened.

REFERENCES:
patent: 3078923 (1963-02-01), Tausch
patent: 4161219 (1979-07-01), Pringle
patent: 4415036 (1983-11-01), Carmody et al.
patent: 4427071 (1984-01-01), Carmody
patent: 4452311 (1984-06-01), Speegle et al.
patent: 4457376 (1984-07-01), Carmody et al.
patent: 4478286 (1984-10-01), Fineberg
patent: 4629002 (1986-12-01), Pringle
patent: 4703805 (1987-11-01), Morris
patent: 4722399 (1988-02-01), Pringle
patent: 5058682 (1991-10-01), Pringle
patent: 5503229 (1996-04-01), Hill, Jr. et al.

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