Oil-well safety-valve and tool for installing the same

Details Oil-well safety-valve and tool for installing the same Oil-well safety-valve and tool for installing the same

1986-10-29

1988-10-11

Novosad, Stephen J.

Wells

Valves, closures or changeable restrictors

Fluid operated

166334, E21B 3410

Patent

active

047763990

ABSTRACT:
An oil-well safety valve comprising a movable shutter (11), an inner tubular slide (9), a return-spring (10) for the slide, hydraulic means for moving the slide downward by pressurization of a control fluid, a system (14) for anchoring the valve in a receiving sleeve (1) and packings (15, 16) at the contact of the receiving sleeve (1), the packings (15, 16) being located on either side of the control fluid intake; the anchoring system (14) being located above the packings and the return spring (10) being located below in a part of the sealed volume receiving the control fluid. The spring being mounted around the slide between a bushing (20) and a ring nut (19) for eliminating any danger of relaxation of the spring during disassembly.

REFERENCES:
patent: 3799258 (1974-03-01), Tausch
patent: 3865141 (1975-02-01), Young
patent: 4252197 (1981-02-01), Pringle
patent: 4294314 (1981-10-01), Miyagishima et al.
patent: 4432417 (1984-02-01), Bowyer
patent: 4473122 (1984-09-01), Tamplen
patent: 4582134 (1986-04-01), Cano et al.
patent: 4605070 (1986-08-01), Morris

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