Valves and valve actuation – Fluid actuated or retarded – Fluid link or column actuator
Reexamination Certificate
2005-07-05
2005-07-05
Fox, John (Department: 3753)
Valves and valve actuation
Fluid actuated or retarded
Fluid link or column actuator
C251S063400
Reexamination Certificate
active
06913240
ABSTRACT:
An electrohydraulic control unit for operating an actuator of a hydraulically controllable device is disclosed. The electrohydraulic control unit comprises a housing including a chamber for hydraulic fluid. The housing is coupled to the actuator such that a path for fluid communication between the chamber and the actuator is created. Disposed within the chamber is a piston for regulating the flow of the hydraulic fluid between the chamber and the actuator. An electric motor is securably attached to the housing. The electric motor includes a selectively rotatable shaft. The electrohydraulic control unit also comprises a converter configured to transform the rotational motion of the shaft to translational motion of the piston, thereby controlling the actuation of the hydraulically controllable device.
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Brochure from Rotork Actuation, Brass Mill Lane, Bath, BA1 3JG England.
Fox John
Halliburton Energy Service,s Inc.
Youst Lawrence R.
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