Fluid delivered by the pump enters through port 1 and shifts valve member 2 to the right, compressing spring 9 and admitting fluid through connection 3 to the power cylinder and pushing floating spool 4 to the left. With its left end, spool 4 opens valve member 5, compressing spring 8 and discharging fluid from the other end of the power cylinder through connection 6 and port 7 to the tank.
$3617$SHP,Va$