an armature rod 8 which has an armature axis 9 and wherein the armature rod 8 is guided into a bushing 24 and one end of the armature rod 8 extends into the interior of a magnet armature 11 the magnet armature 11 forms together with a magnet core 10 and a magnet coil 32 the proportional magnet 3 to connect the control element 7 with the proportional magnet 3 a disc 21 is fastened on said end of the armature rod 8 this end of the armature rod 8 with the disc 21 extend into a substantially cylindrical recess in the magnet armature 11 a spiral compression spring 20 is situated between the disc 21 and the bottom of the recess in the armature 11 a rigid connection is prevented between the armature rod 8 and the magnet armature 11 in the representation shown here the magnet armature 11 is located in an end position specifically the u201c upper u201d stop position so that the distance 13 between the front side 14 of the magnet armature 11 and the front side 15 of the magnet core 10 is maximal in the first end position which corresponds to the hold position of the magnet armature 11 the distance 13 amounts to about 0 to 0 3 mm preferably about lt 0 1 mm the control element 7 is thus moved by the magnet armature 11 via the compression spring 20 and the disc 21 on one side to.