force is sufficient and the pressure forces that hold the sealing body 4 on the main nozzle fit 20 lift it and thus also open the main nozzle 2 fig2 d shows this situation the invention comprises here also the essential aspect that the pilot nozzle 3 moves together with the operating element 6 in the shown embodiment it is not realized as static nozzle but as dynamic nozzle in connection with fig2 the following essential other aspect of the invention has to be pointed out the sealing body 4 does not only have a certain axial motion parallel to the coil axis 72 but also a certain radial motion also with reference to the coil axis 72 this leads to a self adjusting effect of the sealing body 4 on the main nozzle fit 20 it has to be taken into consideration here that the sealing body 4 according to the modification shown for example in fig2 c is not configured as simple cylinder but at a cylindrical or disc like basic body 41 on the side facing the main nozzle 2 a cone like conical hemispheric or ball segment like part body 42 is attached in the middle by a certain radial motion of the sealing body 4 in the recess 64 the sealing body 4 is always positioned perfectly on the main nozzle fit 20 while misalignments are avoided and thus leakage is reduced although the.