Wells – Valves – closures or changeable restrictors – Destructible element
Patent
1989-07-05
1990-03-20
Dang, Hoang C.
Wells
Valves, closures or changeable restrictors
Destructible element
166331, 166334, 251347, E21B 3412
Patent
active
049093266
ABSTRACT:
A tubing unloader including first and second housing sections adapted to be telescopingly mounted in each other and movable between open and closed positions by means of a J-slot assembly wherein an actuator pin for the J-slot includes an actuator portion which not only rides in the J-slot but also may be sheared under emergency conditions.
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