Compressed air preparation unit

摘要

The air conditioning unit (1) has a trailer control valve (53) which is integrated with a main portion. A supply terminal (52) of trailer control valve, is integrated with an emergency brake valve for reducing pressure at a terminal (22) for a coupling head stock (23). The pneumatic brake actuating pressure is produced by trailer control valve in dependence of hydraulic braking pressure. An independent claim is included for commercial vehicle.