3/2 relay valve 480 205 ... 0 The 3/2 relay valve is used to supply air to and remove air quickly from the brake cylinder on the rear axle in case of redundancy, and comprises several valve units which must fulfil the following functions, among others: 2/2 solenoid valve for controlling redundancy in intact electro-pneumatic braking circuit Relay valve function, to improve the time behaviour of redundancy, Pressure retention, to synchronise the beginning of pressure level control on the front and rear axle, in case of redundancy . In case of redundancy, rear axle 1:1 is controlled.
The 3/2 relay valve also has a 3/2 directional control valve to which current is supplied in case of ABS and is thus meant to prevent an involuntary drive through of the rear axle redundancy pressure during ABS control. How it works: Description of components 3. EBS 12