Hydraulic directional valve has central duct passing through main piston and connecting consumer chamber and return chamber which are set at opposite ends of main piston

摘要

The hydraulic valve has a control piston (3) movable against spring force by the tappet of a magnet (12) from a closed position to an opened position. The consumer chamber (8) and the return chamber (20) are set at opposite ends of the main piston (3) and are connected together by a central duct (21) passing through the main piston. The magnet tappet acts on a plunger piston which is displaceable in the valve housing coaxial with the main piston and which has a seat end facing the main piston (3) through which it closes the central duct when striking against the main piston. The plunger piston is pressed by a safety spring against the force of a magnet into the open position so that in the closed position of the main piston the central channel is opened.