Valves and valve actuation – Fluid actuated or retarded – Dashpot or fluid controlled retarder or timer
Patent
1985-09-27
1987-11-17
Schwadron, Martin P.
Valves and valve actuation
Fluid actuated or retarded
Dashpot or fluid controlled retarder or timer
166320, 166332, 251 58, 251303, F16K 120, F16K 31122, F16K 4708
Patent
active
047069333
ABSTRACT:
An oil or gas well flapper-type safety valve is joined in the tubing string and has a cylindrical valve body with a valve seat therein. A flapper valve is hingedly supported from the valve body for movement between a closed position wherein the valve is seated against the seat and an open position wherein the valve is pivoted from the seated position. A control link is attached to the flapper valve at a point removed from the hinge. Control structure is provided for applying a force to the valve through the control link to selectively pivot the valve between its closed and open position. The control structure includes an hydraulically operated piston moveable in a valve control cylinder. The piston is attached to one end of the control link and is biased by a compression spring toward the valve to seat the valve. A pressure supply is communicated to the cylinder in which the piston moves and by applying pressure to the piston to overcome the bias provided by the compression spring, the piston moves downwardly in its cylinder. By way of the control link between the piston and valve, the valve is pivoted to its open position. Closure is likewise controlled by the control of the discharge of fluid from the cylinder.
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Shoaf Joseph
Sukup Richard A.
Hepperle Stephen M.
Schwadron Martin P.
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