When lever 1 is turned counterclockwise, valve spool 2 is shifted to the right. At this, pump 3 delivers fluid through check valve 11 and the directional valve to the upper ends of power cylinders 4, moving pistons 5, to which rollers 6 and members 7 are linked, downward This turns levers 8 about fixed axes A, clamping workpieces 9. Fluid from the lower ends of cylinders 4 is discharged through the directional valve to the tank. Relief valve 10 maintains the required fluid pressure in the system. To release the workpieces, spool 2 is shifted to the left by lever 1, admitting fluid to the lower ends of cylinders 4.
$4286$CHP,GC$