Hydraulic safety stop-valve

Details Hydraulic safety stop-valve Hydraulic safety stop-valve

1974-11-25

1976-12-28

Schwadron, Martin P.

Fluid handling

Systems

Sequentially progressive opening or closing of plural valves

166 72, 166324, E21B 3300

Patent

active

039995747

ABSTRACT:
A hydraulic safety stop-valve fitted with hermetic sealing means.
The equalization passage between pressures above and below the stop-valve comprises two means of sealing, one provided by contact between two truncated conical bearing surfaces on the outer casing and inner tube, and the other consisting of valves, held by springs against the equalization passage inlet apertures, bored in the lower tubular element of the outer casing, and the opening of which is controlled by a truncated conical surface on the inner tube.
This device ensures a high level of safety in stop-valves used in large production tubings for wells at sea.

REFERENCES:
patent: 2373034 (1945-04-01), Laird et al.
patent: 3040811 (1962-06-01), Pistole et al.
patent: 3071151 (1963-01-01), Sizer
patent: 3078923 (1963-02-01), Tausch
patent: 3090443 (1963-05-01), Bostock
patent: 3845818 (1974-11-01), Deaton
patent: 3865141 (1975-02-01), Young

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