Reversible pump 1 delivers fluid from the tank through directional valve 2 to the left end of power cylinder 3, moving piston 4 and table 5, rigidly attached to piston rod 6, to the right. The delivery line of gear pump 7 is connected through reversing rotary pilot valve 8 to the right end of valve 2 whose spool is in its extreme left-hand position. As piston 4 travels to the right, trip dogs a turn lever 9 of reversing valve 8 clockwise. At this fluid from pump 7 is delivered to the left end of valve 2, shifting its spool to the right. The right end of the valve is connected to the tank. When the spool of valve 2 reaches its extreme right-hand position, fluid is delivered by the pump to the right end of power cylinder 3, moving piston 4 and table 5 to the left. Relief valve 10 protects the system against overloads. Adjusting screws 11 and 12 regulate the speed of the forward and return strokes of the table.
$4200$CHP,Dr$