ELECTROMAGNETICALLY ACTUATED VALVE, ESPECIALLY FOR HYDRAULIC ANTISKID BRAKING SYSTEMS IN MOTOR VEHICLES

摘要

PCT No. PCT/DE94/01076 Sec. 371 Date Mar. 25, 1996 Sec. 102(e) Date Mar. 25, 1996 PCT Filed Sep. 17, 1994 PCT Pub. No. WO95/08461 PCT Pub. Date Mar. 30, 1995An electromatically operated valve for automatic setting of a reduced flow cross section effective for a closed position of the valve is to be achieved. The valve has, in a valve dome, a longitudinally movable magnet armature with a separate valve push-rod which carries a closing element of a first seat valve which is open in the rest position. The first seat valve is located in a valve chamber from which a first pressure medium passage leads to a control chamber remote from the closing element and a second pressure medium passage leads to a control chamber, near the closing element, of the magnet armature. In addition, a second valve formed from the magnet armature and the valve push-rod is provided by means of which a connection between the first pressure medium passage and the second control chamber can be switched on and off. When the second valve takes up its closed position, the pressure in the control chamber remote from the closing element effects a displacement of the magnet armature against the force of a return spring and the result of this is a reduction in the flow cross section of the first seat valve. The valve can be employed in slip-controlled hydraulic brake systems of motor vehicles.