303.02.0027 Compatible 4-Circuit Protection Valve

What does a 4-circuit protection valve do?

This 4-circuit protection valve serves as a critical component within the pneumatic brake system, managing air pressure distribution across multiple circuits to ensure braking stability. It is constructed from high-strength components designed to withstand rigorous heavy commercial vehicle operations and prevent system-wide failures in the event of a single circuit leak.

Vehicle compatibility and fitment

This component is compatible with MAN trucks and meets the technical requirements for heavy-duty braking applications. It is also engineered to function within systems requiring specific pressure thresholds, such as the 6.9 BAR opening pressure seen in many professional pneumatic setups.

Installation and maintenance

Technicians should verify that all M22x1.5 ports are properly seated and that the operating pressure does not exceed the maximum limit of 20 BAR during installation. Regular inspection of the valve's response to closing pressures, typically around 4.5 BAR, is recommended to ensure optimal pneumatic control.

Operational safety

For proper maintenance, ensure that no contaminants enter the ports during replacement to maintain the integrity of the internal seals and valves.

OE cross-reference

303.02.0027 (4-circuit protection valve) is the equivalent of the Knorr-Bremse and MAN OE numbers. This part directly replaces Knorr-Bremse OE numbers AE4609, II37460N00. It also replaces MAN OE numbers 81521516095, 81521516098, 81521516099, 81521516105, 81521516106, 81525156105.