Two-stage solenoid valve for an electropneumatic valve control unit

A two-stage solenoid valve for an electropneumatic valve control unit, comprising:

• a solenoid system energizable with a first and second current intensity;
• a solenoid valve cartridge insertable into said solenoid system via a side of said valve control unit, said solenoid valve cartridge having a primary side connectable to at least one first compressed air port and a secondary side connectable to at least one second compressed air port, said solenoid valve cartridge having a stepped body and comprising a rear region, a front region, and a central region, wherein:
• said rear region has a larger diameter than diameters of said front and central regions;
• said front region houses a secondary armature spring;
• said central region at least partly houses a primary armature and a secondary armature;
• and
• said rear region houses a primary armature spring;
• a primary valve disposed on said primary side, said primary valve having said primary armature displaceable pre-loaded by said primary armature spring for bearing on at least one primary valve seat;
• and
• a secondary valve disposed on said secondary side, said secondary valve having said secondary armature displaceably pre-loaded by said secondary armature spring for bearing on at least one secondary valve seat, said secondary armature having a smaller cross section than said primary armature.