for instance the recess 35 of the exemplary embodiment described above for receiving the bead 36 of the guide sleeve 19 is used here as well for that purpose the recess 35 may be formed in a non material removing manner in the form of an additional bead producing this bead 36 may be done either after the deep drawing and before the insertion of the guide sleeve 19 or else this bead is made only after the insertion of the guide sleeve 19 into the bush 29a being produced simultaneously with the bead 36 of the guide sleeve 19 a female die not shown fitting around the transitional region 33 is used to form the recess 35 in the exemplary embodiments described in conjunction with fig1 4 the recesses 35 act as stops in two axial directions however if the guide sleeve 19 with its bead 36 together with the magnet core 24 needs to be anchored merely against hydraulic pressure in the valve block 11 then a securing flange 30b with a recess 35b which in the manner of a bore step adjoins a borelike opening 34b in the bush 29b is sufficient for this exemplary embodiment of fig5 the bead 36 is produced prior to insertion of the guide sleeve 19 into the securing flange 30b by comparison fig6 shows a further feature of a combination of the guide sleeve 19 and securing flange 30b by providing a crimp 58 made from the material of the securing flange 30b this crimp 58 can be produced by pressing in a notchlike annular groove 59 into the securing flange 30b on the face end the provision of the crimp 58 fixes the guide sleeve 19 in.