Link 10 turns about fixed axis A and is connected by turning pair B to lever 8 which, in turn, is connected by turning pair C to link 11. Link 11 is connected by turning pair E to valve housing 9. Lever 8 has fork a which engages pin D of piston rod 7. When valve spool 1 is shifted to the left, fluid is delivered by pump 2 through port 5 to the left end of power cylinder 3, moving its piston to the right. At the same time, fluid from the right end of cylinder 3 is discharged through port 6 to tank 4. By lever 8, piston rod 7 is linked to valve housing 9 which, consequently, moves to the left when piston rod 7 moves to the right. When the motion of spool 1 is stopped, fluid continues to be delivered to the left end of cylinder 3 until housing 9 reaches a position in which port 5 is blocked off by a land of spool 1. At the same time, port 6 is blocked off by another land. This will stop fluid delivery to cylinder 3 and discharge from the cylinder, locking the piston in a definite position. When valve spool 1 is shifted in the other direction, the process is repeated in the reverse direction.
$4167$CHP,Dr$