Wells – Valves – closures or changeable restrictors – Fluid operated
Patent
1990-07-11
1991-07-09
Neuder, William P.
Wells
Valves, closures or changeable restrictors
Fluid operated
166334, E21B 3410
Patent
active
050296469
ABSTRACT:
A well safety valve having a flow tube telescopically controlling the movement of a valve element. A coil spring yieldably moves the tube in a direction for opening the valve and a choke bean is connected to the flow tube for controlling the closure of the valve. A spring-loaded release latch engages the flow tube yieldably preventing the flow tube from moving to the closed position. The latch is adjustable and includes a belleville spring for providing a large restraining force without undue deflection.
REFERENCES:
patent: 3070119 (1962-12-01), Raulins
patent: 4129184 (1978-12-01), Parker
patent: 4362214 (1982-12-01), Pringle et al.
patent: 4664195 (1987-05-01), Deaton
patent: 4691779 (1987-09-01), McMahan et al.
Camco International Inc.
Neuder William P.
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