DR. ROBERT GUY FARRELL, O.D.
Optometry at Macomb Pl, Mount Clemens, MI

4201052, May 6, 1980

Mar 26, 1979

6/024058

Robert H. Breeden - Metamora MI
Robert G. Farrell - Ortonville MI
Henry D. Taylor - Pontiac MI

Sperry Rand Corporation - Troy MI

F16H 3946, F15B 1116

60445

A hydraulic control system comprising a hydraulic actuator having opposed openings adapted to alternately function as inlets and outlets for moving the element of the actuator in opposite directions and a variable displacement pump with loading sensing control for supplying fluid to said actuator. A meter-in valve is provided to which the fluid from the pump is supplied and a pilot controller alternately supplies fluid at pilot pressure to the meter-in valve for controlling the direction and displacement of movement of the meter-in valve and the direction and velocity of the actuator. A pair of lines extends from the meter-in valve to the respective openings of the actuator and a meter-out valve is associated with each line of the actuator for controlling the flow out of the actuator when that line to the actuator does not have pressure fluid from the pump applied thereto. Each meter-out valve is pilot operated by the pilot pressure from the controller.