Equalizing means for a subsurface well safety valve

Details Equalizing means for a subsurface well safety valve Equalizing means for a subsurface well safety valve

1986-09-26

1987-11-03

Novosad, Stephen J.

Wells

Valves, closures or changeable restrictors

Fluid operated

166332, E21B 3410

Patent

active

047038055

ABSTRACT:
A subsurface well safety valve having an equalizing line between a point below the safety valve and a point above the safety valve and an equalizing valve in the line. A sleeve valve is releasably locked in a first position opening the equalizing line and in a second position closing the equalizing line for protecting the equalizing valve or closing the equalizing line in the event the equalizing valve develops a leak.

REFERENCES:
patent: 3071193 (1963-01-01), Raulins
patent: 3675718 (1972-07-01), Kanady
patent: 3799258 (1974-03-01), Tausch
patent: 3845818 (1974-11-01), Deaton
patent: 4007798 (1977-02-01), Gazda
patent: 4161219 (1979-07-01), Pringle
patent: 4325431 (1982-04-01), Akkerman
patent: 4454913 (1984-06-01), Guidry et al.
patent: 4552219 (1985-11-01), Wong
patent: 4597445 (1986-07-01), Knox
patent: 4629002 (1986-12-01), Pringle

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