is pushed upwardly relative to the armature 3 u2033 until the stop surface 27 u2032 of the tappet 8 u2032 is at a predetermined axial distance from the stop 30 in the housing part 2 further the deformable area 33 is compressed downwardly until its stop plane is at a defined distance from the valve seat 7 thereafter the support member 6 can be slipped into the bottom housing part 2 until stop 30 with the result that the desired operating stroke is adjusted in the embodiment of fig6 the housing 1 2 includes a stopped bore 36 whose top portion 37 has the smallest diameter and is closed by a plastically deformable housing wall portion 38 which is designed integrally with the housing 1 2 a pin 39 is arranged in this portion 37 in the mid portion 40 the axially slidable armature 3 u2033 with the attached tappet 8 u2033 is arranged as well as a magnetic core 41 with a guide bore for the tappet 8 u2033 a resetting spring 42 which acts in he opening direction is compressed between the armature 3 u2033 and the magnetic core 41 a valve seat 44 is pressed into the bottom portion 43 of the stepped boe 36 which has the largest diameter fig6 depicts a variation showing what a customary no valve would look like based on the above suggestions the position of the sealing ball of the tappet 8 u2033 is dictated by the bead 30 u2032 and is adjusted by deformation of the area 38 and the related movement of the pin 39 which has previously been pressed in tappet.