51 54122 0011 SÜ Compressor Relief Valve — MAN

What does a compressor safety valve do?

This compressor safety valve serves as a critical protection component within the pneumatic air brake system. By regulating the pressure generated by the compressor, it prevents over-pressurization, thereby protecting both the compressor assembly and the downstream braking components from damage.

Compatible MAN SÜ models

This specific valve is engineered for compatibility with MAN SÜ models, including SÜ 353, SÜ 273, SÜ 313, SÜ 320, and SÜ 360. It is designed to maintain system integrity under heavy commercial vehicle operating conditions.

Installation and technical specifications

The component features an M26 port connection and is rated for a 17 BAR operating pressure. For proper installation, technicians should ensure the threaded connection to the compressor housing is secure and that all seals are seated correctly to prevent air leaks.

Maintenance and inspection

Regular inspection of the relief mechanism is recommended during scheduled maintenance to ensure the mechanical spring remains responsive and capable of venting pressure as required by the vehicle's service specifications.

OE cross-reference

7700 920 001 (Compressor Safety Valve) is the equivalent of the MAN OE number. This part directly replaces MAN OE number 51541220011.