Fluid is delivered by pump 2 at constant pressure to directional valve 3 and further through flow-control valve 4 and valve 5, along pipeline b to the right end of cylinder 6. Piston 7, together with the machine tool table, moves to the left. From the left end of cylinder 6, fluid is discharged through flow-control valve 8, regulating the back pressure in cylinder 6, along pipeline c, through valve 5 and along pipeline d to tank 1. When the spool of valve 5 is shifted to the left, fluid is delivered through directional valve 3 and pipeline a to valve 5 and further, through open flow-control valve 8 to the left end of cylinder 6. Piston 7 with the table travels at higher speed to the right because the volume (effective cross-sectional area) of the left end of the cylinder is less than that of the right end. Fluid discharged from the right end of cylinder 6 drains to tank 1 through pipelines b and f. Surplus fluid is discharged back to tank 1 through relief valve 9. Handwheel 10 serves to regulate flow-control valve 4, and handle 11 to regulate the force exerted by the spring of valve 9.
$4159$CHP,Dr$