As the machine tool table travels downward, stop a of the table trips two-arm lever 1 which turns about fixed axis A, turning the lever clockwise. At this, stem 2 of the pilot valve is shifte to the right and, owing to the special shape of land k, the delivery of high-pressure fluid, passing through the grooves of valve spool 3 to the working end of the power cylinder, is gradually reduced, thereby reducing the speed of the table. As the pilot valve spool is shifted, high-pressure fluid, admitted throughh port b, is delivered to the left end of spool 3, shifting it to the right as well. At this, the table reverses and begins to travel upward. Fluid from the right end of spool 3 is drained to the tank. At the moment of reversal, the motion of pilot valve spool 2 to the right is restricted because lug e of lever 1 contacts stop f of the table . As the table continues upward motion, stop f releases lever 1, valve stem 2 is shifted to the left by the action of fluid on spool land d. At this, spool 3 also shifts to the left, increasing fluid delivery to the power cylinder and thereby accelerating the table after reversal.
$3921$LHP,FC$