Gear pump 6 delivers fluid at constant pressure to the left end of cylinder 1, and piston 2, together with machine tool table 3, travels to the right. Fluid exhausted from the right end of cylinder 1 passes to rotary valve 4 and to valve spool 5. If valve 4 is positioned so that pipeline a is closed and pipeline b is open, the discharged fluid drains to the tank and table 3 travels at maximum speed. If valve 4 is positioned so that pipeline a is open and pipeline b is closed, valve spool 5 is shifted to the left by the pressure of the fluid, and the fluid delivered by pump 6 is discharged back to the tank. At this, table 3 stops. Thus, by changing the position of valve 4, it is possible to regulate the amount of fluid delivered to cylinder 1 and, consequently, the speed of travel of table 3.
$4147$CHP,Dr$