Gear pump 1 delivers fluid under a pressure established by relief valve 2 through rotary directional valve 3 and flow-control valves 4 and 5 to power cylinders 6 and 7. Fluid from the exhaust end of the cylinders is discharged through valve 3 to the tank. Flow-control valves 4 and 5 can be regulated to admit equal amounts of fluid to cylinders 6 and 7. Check valves 8 and 9, enabling the fluid to by-pass the flow-control valves, provide for rapid return strokes when valve 3 is switched over.
$4218$CHP,Dr$