Air supply unit for a pneumatic system of a commercial vehicle

An air supply unit for a pneumatic system of a commercial vehicle, the air supply unit comprising:

• a compressor inlet to be connected to a compressor for receiving compressed air when the air supply unit is in a supply mode,
• a consumption outlet for connecting at least one consumption circuit of the commercial vehicle,
• an air processing unit connected to the compressor inlet for drying and filtering the compressed air and delivering generating dried compressed air, the air processing unit adapted to receive the compressed air from the compressor inlet and deliver the dried compressed air to an outlet,
• a supply line extending from the outlet to the consumption outlet of the air supply unit,
• a purge tank connected to the supply line for receiving and storing the dried compressed air from the supply line as stored dried compressed air when the air supply unit is in the supply mode and delivering the stored dried compressed air as purge air when the air supply unit is in a purge mode through the supply line to the air processing unit for regenerating the air processing unit, and
• a separating valve connected between a first section and an end section of the supply line, the end section extending to the consumption outlet,
• wherein the purge tank is connected to the supply line through a throttle for pressure reduction of the purge air,
• wherein the purge tank is further connected to the supply line by a filling valve, and
• wherein the filling valve is open when the air supply unit is in the supply mode and blocking when the air supply unit is in the purge mode.