303.02.0074 Compatible 4-Circuit Protection Valve
303.02.0074
Summary
This 4-circuit protection valve is engineered for heavy commercial vehicle brake systems. It features M22x1.5 and M16x1.5 port configurations with specific opening pressures of 7 BAR to ensure reliable pneumatic circuit separation and safety. Equivalent to OE Knorr-Bremse AE4169.
| EAN Code | 8683457009332 |
|---|
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Compatible OEM Codes
-
KNORR-BREMSE
- AE 4169
Description
What does a protection valve do?
This protection valve serves a critical role in the pneumatic brake system of heavy commercial vehicles by dividing the air supply into multiple independent circuits. By monitoring pressure levels, it ensures that a leak in one circuit does not compromise the entire braking capability of the vehicle. Built with high-strength components, this unit provides consistent performance under demanding heavy-duty conditions.System compatibility and ports
The component is designed for compatibility with Knorr-Bremse systems and other heavy commercial vehicle braking architectures. It manages air distribution through specific port sizes, including M22x1.5 for the primary inlet and M16x1.5 for the subsequent outlets, ensuring precise pressure regulation across all four circuits.Installation and maintenance
For proper installation, technicians should verify that all port connections are secure and that the opening pressures (7 BAR) and closing pressures (ranging from 4.2 to 5.5 BAR depending on the circuit) align with the vehicle's technical requirements. Regular inspection of the seals and connection points is recommended during routine maintenance intervals to prevent pressure drops.Troubleshooting guidance
In cases of system pressure loss or uneven braking response, inspecting this valve is a primary step in troubleshooting pneumatic failures.OE cross-reference
303.02.0074 (4-circuit protection valve) is the equivalent of the Knorr-Bremse OE number. This part directly replaces Knorr-Bremse OE number AE4169.Technical Specifications
| Port 1 | M22x1,5 |
|---|---|
| Port 21 | M16x1,5 |
| Port 22 | M16x1,5 |
| Port 23 | M16x1,5 |
| Port 24 | M16x1,5 |
| Opening Pressure 21 | 7 BAR |
| Opening Pressure 22 | 7 BAR |
| Opening Pressure 23 | 7 BAR |
| Opening Pressure 24 | 7 BAR |
| Closing Pressure 21 | 4,2 BAR |
| Closing Pressure 22 | 4,2 BAR |
| Closing Pressure 23 | 5,5 BAR |
| Closing Pressure 24 | 5,5 BAR |
Other OEMs
KNORR-BREMSE
- AE4169
- AE 4169
Related Products
Repair Kits
Compatible Vehicles
| Brand | Model | Model Type | Engine |
|---|---|---|---|
| KNORR-BREMSE |
FAQ
What is the primary function of this 4-circuit protection valve?
It splits the air supply into four independent circuits, ensuring that if one circuit loses pressure due to a leak, the remaining circuits stay functional to maintain braking safety.
What are the port specifications for this component?
This valve is equipped with an M22x1.5 inlet port and four M16x1.5 outlet ports to facilitate standard heavy commercial vehicle pneumatic connections.
How do I know if this valve is compatible with my system?
Check if your current system uses Knorr-Bremse or similar standards and verify that your opening pressure requirements match the 7 BAR specification provided.
What are typical symptoms of a faulty protection valve?
Technicians should look for unexpected pressure drops in specific circuits or a failure to maintain required holding pressures during braking tests.
What are the OE reference numbers of this part?
303.02.0074 directly replaces Knorr-Bremse OE number AE4169.