Double seated well valve

Details Double seated well valve Double seated well valve

1987-01-12

1988-01-05

Novosad, Stephen J.

Wells

Valves, closures or changeable restrictors

Fluid operated

166332, E21B 3410

Patent

active

047169680

ABSTRACT:
A double seated well circulating valve for use in a well conduit having a tubular housing with a vertically extending bore therethrough and a port providing communication between the inside and outside of the housing. A first valve seat is horizontally positioned in the bore below the port and a second valve seat is in communication with the port. A valve closure member is movable between the first and second valve seats for alternately closing and opening fluid flow through the bore and through the port. A flow tube telescopically moves in the housing for controlling movement of the valve closure member. A piston and cylinder assembly controls the flow tube and biasing means acts to move the flow tube upwardly.

REFERENCES:
patent: 4527630 (1985-07-01), Pringle
patent: 4597445 (1986-07-01), Knox
patent: 4605070 (1986-08-01), Morris
patent: 4655288 (1987-04-01), Burris et al.

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