Pump 1 delivers fluid through starting valve 2 and directional valve 3, controlled by reversing pilot rotary valve 4, to the right end of cylinder 5, moving piston 6 and the machine tool table, rigidly attached to the piston rod, to the left. Fluid from the left end of cylinder 5 is discharged through flow-control valve 10 and valve 3 to the tank. In this case, the left end of valve 3 is connected to the delivery line. Pressure reducing valve 9 automatically regulates the pressure before flow-control valve 10 and the speed of the table. The pressure in the discharge pipeline acts on the upper end of spool 7 against the action of spring 11. Upon an increase inspeed and, consequently, in pressure before valve 10, spool 7 moves downward and by-passes a part of the fluid from the delivery line to the tank, thereby reducing the speed. When the pressure drops, spool 7 moves upward, reducing the amount of fluid by-passed to the tank and maintaining the preset speed. As the table travels to the left, trip dog a, mounted on the table, turns the lever of reversing valve 4. This connects the right end of valve 3 to the delivery line, and the left end to the tank, shifting the spool of valve 3 to the left. Then fluid is delivered by the pump to the left end of cylinder 5, through check valve 12, by-passing flow-control valve 10 and pressure reducing valve 9. At this, piston 6 and the table travel rapidly to the right (rapid return stroke). Relief valve 8 protects the system against overloads.
$4196$CHP,Dr$