DUAL-PISTON RELAY VALVE HAVING AN ANTI-COMPOUNDING FUNCTION

摘要

The invention relates to a relay valve (1) for a vehicle, said valve comprising a parking brake piston (3) that is displaceable in a housing (2) and an axially displaceable cuff (4), a first compressed-air chamber (a) for receiving compressed air from a control line (31) being formed between the parking brake piston (3) and the housing (2). The valve is also provided with a first spring element (6a), which axially applies a pre-tensioning force to the cuff (4), and with a second spring element (6b), which axially applies another pre-tensioning force to the parking brake piston (3). According to the invention, an axially displaceable service brake piston (7) is arranged axially between the parking brake piston (3) and the cuff (4), the service brake piston resting at least radially against the parking brake piston (3) and radially against the housing (2) in a sealing manner, in order to form a second compressed-air chamber (b).