Pump 1 delivers fluid under pressure through starting valve 3 to a groove of the spool in directional valve 4. From here a part of the fluid is delivered through ball check valve 5 to rotary actuator 6, turning its shaft clockwise. The remainder of the fluid is delivered to the left end of cylinder 7, moving piston 8 to the right. Fluid from the exhaust chamber of actuator 6 and the right end of cylinder 7 passes through valve 4 to the tank. Valve 4 is controlled by trip dogs mounted on the machine tool table. When its spool is shifted to the right, the actuator and the piston of the hydraulic cylinder are reversed.
$4202$CHP,Dr$