303.02.0018 Compatible Multi-circuit Protection Valve

What does a protection valve do?

This multi-circuit protection valve plays a critical role in the pneumatic brake system by managing air pressure distribution across multiple circuits. By isolating different brake circuits, it prevents total system loss in the event of a leak in a single line, ensuring the vehicle maintains braking capability. It is constructed from high-strength components to withstand heavy-duty service conditions.

System compatibility and fitment

This component is designed for compatibility with Knorr-Bremse systems and other heavy commercial vehicle braking architectures. It provides reliable pressure regulation through specialized port configurations to ensure consistent performance across the entire pneumatic network.

Installation and technical specifications

The unit features M22x1.5 VOSS ports for secure connections. Technicians should verify the opening pressures, which are set at 9 BAR for ports 21/22 and 7.5 BAR for ports 23/24, alongside their respective closing pressures of 4.5 BAR and 5.5 BAR, during installation to ensure correct system calibration.

Maintenance and troubleshooting

Regular inspection of the valve ports and pressure settings is recommended to prevent air leaks or improper circuit isolation in heavy commercial vehicles.

OE cross-reference

303.02.0018 (Multi-circuit Protection Valve) is the equivalent of the Knorr-Bremse OE numbers. This part directly replaces Knorr-Bremse OE numbers AE4505, II31163N.