To accomplish a certain required operation, spool 1 is shifted to the left. At this, fluid delivered by the pump along channel 2 is admitted to port 3 and further to the working main. Return flow passes through port 4 and an axial channel of spool 1 to port 5 and into the tank. For the next operation, spool 1 is shifted to the right, admitting fluid from channel 2 into port 4. Return flow passes through port 3 to port 5 and into the tank. When spool 6 is shifted to the right, fluid from channel 2 passes along side grooves of pusher 8, opening check valve 9, and is admitted through port 7 to the working main. Fluid is discharged from the exhaust end of the power cylinder through port 10, check valve 11 and internal passages of the valve body to port 5 and the tank. For the opposite operation, spool 6 is shifted to the left. Then, fluid from channel 2 opens check valve 12, and is admitted through port 10 to the working main. Fluid discharged from the exhaust ends passes through port 7, check valve 13 and the axial channel of spool 6 to port 5 and the tank.
$3657$SHP,FC$