Externally adjusted spring actuated well valve

Details Externally adjusted spring actuated well valve Externally adjusted spring actuated well valve

1979-04-27

1981-02-03

Leppink, James A.

Wells

Valves, closures or changeable restrictors

Fluid operated

13750525, 137524, F04F 108, E21B 4312

Patent

active

042483085

ABSTRACT:
In a well valve such as a safety valve or gas lift valve for controlling the fluid flow through a well tubing having a valve closure member with means for moving the valve member in a direction to open the valve and spring means acting against the opening force for moving the valve to a closed position, the improvement of an external adjustment for adjusting the spring closing force. A shoulder member is longitudinally movable in the housing but non-rotatably movable relative to the housing and abuts the spring. Adjusting means is rotatably connected, but is longitudinally fixed, relative to the housing and is exposed to the exterior of the housing for allowing external rotation of the adjusting means. Coacting threads between the shoulder means and the adjusting means moves the shoulder toward and away from the spring by externally rotating the adjusting means thereby varying the closing force of the spring.

REFERENCES:
patent: 2059540 (1936-11-01), Sephan
patent: 3255774 (1966-06-01), Gallagher et al.
patent: 3298392 (1967-01-01), Wilcox
patent: 3782461 (1974-01-01), Watkins
patent: 3830296 (1974-08-01), Shirley
patent: 4067350 (1978-01-01), Raggio

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