303.02.0047 Compatible 4-Circuit Protection Valve

What does a 4-circuit protection valve do?

This 4-circuit protection valve plays a critical role in the pneumatic brake system of heavy commercial vehicles. It functions by distributing supply pressure to four independent circuits, ensuring that a pressure loss in one section does not compromise the entire braking capability. This component is manufactured with high-strength components to withstand demanding operational environments.

Vehicle and system compatibility

The valve is specifically engineered for compatibility with Iveco vehicles and Knorr-Bremse systems. It maintains optimal pressure distribution across the braking circuits to ensure safety and reliability during operation.

Installation and technical specifications

For proper maintenance, technicians should verify that all port connections—including the M22x1.5 and M16x1.5 threads—are secure and free of leaks. The unit operates at a maximum pressure of 20 BAR, with specific opening pressures set at 7.5 BAR and closing pressures at 5.2 BAR for the secondary ports to ensure precise pneumatic control.

Maintenance guidance

Consult your authorized distributor.

OE cross-reference

303.02.0047 (4-circuit protection valve) is the equivalent of the Iveco and Knorr-Bremse OE numbers. This part directly replaces Iveco OE number 42530049. It also replaces Knorr-Bremse OE number AE4641.