TWIN CHAMBER AIR DRYER AND PNEUMATIC SYSTEM

The invention relates to a twin chamber air dryer (1) for a pneumatic system of a commercial vehicle, said twin chamber air dryer comprising: a supply inlet port (11), a supply outlet (21), a compressor control outlet (40), and an exhaust outlet (30), a first desiccant cartridge (101) and a second desiccant cartridge (102), to be operated alternately, a toggling valve assembly (121, 122) for switching between said desiccant cartridges, a pneumatically controlled purge valve (126) switchable between a blocking basic position and an activated position, and a solenoid valve assembly (6) comprising - a directional control solenoid valve (7) receiving an electrical direction control signal (S1) and controlling said toggling valve assembly, - a regeneration solenoid valve (8) receiving an electrical regeneration control signal (S2) and providing pressurized air in regeneration phases of the desiccant cartridge, and - a governor solenoid valve (9) receiving an electrical governor control signal (S3) and controlling the purge valve (126) and a compressor mode, wherein said solenoid valves can be operated independently by said control signals.