Multi-stage sliding valve fluid operated and pressure balanced

Details Multi-stage sliding valve fluid operated and pressure balanced Multi-stage sliding valve fluid operated and pressure balanced

1977-09-21

1979-01-16

Purser, Ernest R.

Wells

Valves, closures or changeable restrictors

Fluid operated

137629, 166324, E21B 4312

Patent

active

041344545

ABSTRACT:
Disclosed is an axially movable valve for admitting fluid to a fluid starved region. The admitted fluid feeds a pressure generating pump. Fluid pressure generated by the pump provides a force to further open the valve and to move a tool actuator. The valve opens with minimal sliding friction resistance. During the opening sequence, the flow area of the valve gradually increases. This abstract is neither intended to define the scope of the invention, which, of course, is measured by the claims, nor is it intended to limit the invention in any way.

REFERENCES:
patent: 2033563 (1936-03-01), Wells
patent: 2842162 (1958-07-01), Schwegman
patent: 3583442 (1971-06-01), Dollison
patent: 3703193 (1972-11-01), Raulins
patent: 3930540 (1976-01-01), Holden et al.
patent: 3974876 (1976-08-01), Taylor

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