Patent ID: 8539979

Claim:
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.