51 54122 8001 HOCL MAN Compressor Relief Valve

What does a compressor safety valve do?

This compressor safety valve serves as a critical protection component within the pneumatic brake system. By regulating the air pressure generated by the compressor, it prevents overpressure conditions that could damage the compressor housing or the air brake lines. Built with high-strength components, this valve ensures the system operates within safe limits even under heavy-duty service conditions.

Vehicle and engine compatibility

This specific component is compatible with MAN HOCL trucks, including models such as the 18.310 HOCL-NL, 18.400 HOCL, 18.430 HOCL, 18.440 HOCL, 24.440 HOCLN, 18.360 HOCL, and 18.320 HOCL-NL. It functions as a reliable replacement for original equipment to maintain system integrity in heavy commercial vehicle fleets.

Installation and maintenance

Installation should be performed by a workshop technician to ensure correct seating on the M26 port. During replacement, it is essential to verify that the 17 BAR pressure rating aligns with the vehicle's manufacturer specifications to prevent air leaks or improper venting. Regular inspection of the valve and its connection points is recommended during routine brake system maintenance.

System protection and reliability

Proper selection of this valve ensures that the pneumatic system remains stable during intensive operation, protecting both the compressor and the overall braking performance.

OE cross-reference

7700 920 001 (Compressor Safety Valve) is the equivalent of the MAN OE number. This part directly replaces MAN OE number 51541228001.