Subsurface safety valve of minimized length

Details Subsurface safety valve of minimized length Subsurface safety valve of minimized length

1994-10-19

1996-10-15

Look, Edward K.

Valves and valve actuation

Fluid actuated or retarded

Piston type expansible chamber reciprocating valve actuator

251 89, 166321, 166323, E21B 3412

Patent

active

055646751

ABSTRACT:
A subsurface safety valve of minimized length comprises a tubular valve housing with a valve closure member therein movable between an open and a closed position, an axially shiftable flow tube for opening the valve closure member, a plurality of longitudinally disposed springs radially spaced about the housing for biasing the flow tube to a closed position, and a piston and cylinder assembly to move the flow tube to an open position, with a portion of the assembly longitudinally overlapping at least one of the springs. The safety valve includes simple mechanisms to lock out the safety valve, and to establish secondary hydraulic communication with a wireline set secondary valve set within the locked out safety valve.

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patent: 4926945 (1990-05-01), Pringle et al.
patent: 5159981 (1992-11-01), Le
patent: 5411096 (1995-05-01), Akkerman

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