Fluid is drawn in from tank 1 through suction pipe a to hydraulic pump 2 from where it enters the delivery pipeline. In the right-hand position (as shown) of lever 3, turning about fixed axis A, fluid from the delivery pipeline passes through directional valve 4 to the right end of cylinder 5, moving piston 6, piston rod 7 and table 8, attached to the piston rod, to the left. From the left end of cylinder 5, fluid is discharged through valve 4 to tank 1. In the left-hand position of lever 3, fluid is delivered to the left end of cylinder 5, moving table 8 to the right. In this case, fluid from the right end of cylinder 5 is discharged through valve 4 to tank 1. Lever 3 is turned by trip dogs b mounted on travelling machine tool table 8. Flow-control valve 9 regulates the amount of fluid delivered to cylinder 5. Surplus fluid is discharged back to tank 1 through relief valve 10. Pilot valve 12 serves to control the motion of valve spool 11 and to eliminate uncertainty in the positions of lever 3. The speed of the piston and table is set up by regulating flow-control valve 13.
$4157$CHP,Dr$