Magnetic valve for a traction-controlled hydraulic brake system for motor vehicles

A magnetic control valve (10) for a brake system for a vehicle, the control valve is disposed in a brake fluid intake line (14) that extends between a master cylinder (11) and an intake side of a pump (13), of a slip-controlled hydraulic brake system for motor vehicles, comprising:

• a housing;
• an armature (23) that is longitudinally movable in a bore in said housing toward a pole core (20) counter to a force of a first restoring spring (22) by an electromagnet (17);
• an auxiliary valve (35), which comprises an auxiliary closing piece (47) and an auxiliary valve seat (46) of a small sealing diameter, is actuatable directly by the armature (23);
• a main valve (36), which has a main closing piece (53) and a main valve seat (54) of large sealing diameter, is actuatable indirectly by the armature (23);
• the auxiliary valve (35) and the main valve (36) are disposed in a valve chamber (26), which communicates unthrottled with an inflow side (29) of the magnetic valve (10);
• the auxiliary valve (35) and the main valve (36) have a common closing body (37) which is movable with a limited stroke relative to the armature (23);
• the auxiliary valve (35) communicates with an outflow side (30) of the magnetic valve (10) through at least one bore (55) that passes through the closing body (37), and the main valve (36) communicates with the outflow side (30) directly;
• the magnetic valve (10) when supplied with current assumes an open position, in which the closing body (37) is held, by a force of a second restoring spring (40) at least indirectly engaging the armature (23), in its position blocking the auxiliary valve (35).