303.02.0023 KNORR-BREMSE Multi-circuit Protection Valve

This multi-circuit protection valve is a critical component in the pneumatic braking systems of heavy commercial vehicles, designed to manage pressure distribution across multiple circuits effectively. It ensures that even if one circuit experiences a failure or leak, the integrity of the remaining circuits is maintained to prevent total brake loss. Built with heavy-duty grade materials, this valve provides reliable pressure regulation for long-term operational safety.

303.02.0023 is the OE-equivalent of the KNORR-BREMSE AE 4528 S multi-circuit protection valve used in compatible heavy commercial vehicle braking systems. This component features a precise configuration with Port 1 at M16x1,5 and Ports 21 through 26 utilizing M22x1,5 threading. The technical specifications include opening pressures of 7 BAR for most circuits and 7,5 BAR for Port 23, with a consistent closing pressure of 4,5 BAR to ensure stable pneumatic performance.

For workshop technicians, this part offers straightforward installation and maintenance compatibility within the brake system architecture. The specific port sizes (M16x1,5 and M22x1,5) must be matched carefully during assembly to ensure a leak-free connection and optimal pressure response. Regular inspection of the pressure sensor and port seals is recommended to maintain the high standards of heavy vehicle safety and system reliability.