Hydraulic valve actuating means for subsurface safety valve

Details Hydraulic valve actuating means for subsurface safety valve Hydraulic valve actuating means for subsurface safety valve

1987-01-12

1988-01-05

Leppink, James A.

Wells

Valves, closures or changeable restrictors

Fluid operated

166332, E21B 3410

Patent

active

047169699

ABSTRACT:
A subsurface safety valve having a piston and cylinder assembly for actuating the safety valve. First and second flow sealing valves are positioned in communication with a flow control passageway to the assembly in which said first and second valves open and close in response to the movement of the piston relative to the cylinder. The first valve shuts off fluid flow from the fluid control passageway to the assembly when the safety valve is open and the second valve to shuts off fluid flow from the cylinder to the fluid control passageway when the safety valve is closed. A third valve may be positioned on the side of the piston in communication with the fluid control passageway and is redundantly positioned with the second valve. A lost motion connection may be provided for sequentially actuating the second and third valves.

REFERENCES:
patent: 4527630 (1985-07-01), Pringle
patent: 4569398 (1986-02-01), Pringle
patent: 4574889 (1986-03-01), Pringle
patent: 4601341 (1986-07-01), Pringle

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