303.02.0071 Knorr-Bremse Compatible 4-Circuit Protection Valve
303.02.0071
Summary
This 4-circuit protection valve is engineered for heavy commercial vehicle brake systems. It features specialized port configurations including M22x1.5 and M16x1.5, with precise opening pressures for ports 21, 22, 23, and 24 to ensure optimal pneumatic circuit management. Equivalent to OE Knorr-Bremse AE4452.
| EAN Code | 8683457009301 |
|---|
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Compatible OEM Codes
-
KNORR-BREMSE
- AE 4452
Description
What does a 4-circuit protection valve do?
This 4-circuit protection valve serves as a critical component within the pneumatic brake system, ensuring that air pressure is distributed correctly across multiple circuits. By managing pressure differentials, it prevents a single leak from compromising the entire braking capacity of the vehicle. Built with high-strength components, it provides reliable performance under demanding operational conditions.Compatibility and system integration
This component is compatible with Knorr-Bremse systems used in heavy commercial vehicle applications. It ensures precise pressure regulation across its various outlets, maintaining the integrity of the pneumatic lines during intense braking cycles.Installation and technical specifications
For professional installation, technicians should verify the port sizes: Port 1 utilizes an M22x1.5 thread, while ports 11, 12, 21, 22, 23, and 24 utilize M16x1.5 threads. The unit is designed for a maximum operating pressure of 10 BAR. Regular inspection of the opening and closing pressures—such as the 6.9 BAR opening pressure on ports 21 and 22—is recommended during routine maintenance to ensure system safety.Maintenance and troubleshooting
Consult your authorized distributor to ensure correct fitment and application for your specific fleet requirements.OE cross-reference
303.02.0071 (4-circuit protection valve) is the equivalent of the Knorr-Bremse OE number. This part directly replaces Knorr-Bremse OE number AE4452.Technical Specifications
| Port 1 | M22x1,5 |
|---|---|
| Port 12 | M16x1,5 |
| Port 21 | M16x1,5 |
| Port 22 | M16x1,5 |
| Port 11 | M16x1,5 |
| Port 23 | M16x1,5 |
| Port 24 | M16x1,5 |
| Pressure | MAX 10 BAR |
| Opening Pressure 21 | 6,9 BAR |
| Opening Pressure 22 | 6,9 BAR |
| Opening Pressure 23 | 7 BAR |
| Opening Pressure 24 | 7,5 BAR |
| Closing Pressure 21 | 4,5 BAR |
| Closing Pressure 22 | 4,5 BAR |
| Closing Pressure 23 | 4,5 BAR |
| Closing Pressure 24 | 6 BAR |
Other OEMs
KNORR-BREMSE
- AE4452
- AE 4452
Related Products
Repair Kits
Compatible Vehicles
| Brand | Model | Model Type | Engine |
|---|---|---|---|
| KNORR-BREMSE |
FAQ
What is the function of a 4-circuit protection valve?
It manages air pressure distribution across four separate pneumatic circuits to ensure that a leak in one circuit does not result in a total loss of braking capability.
What are the technical port specifications for this valve?
The unit features an M22x1.5 thread on Port 1 and M16x1.5 threads on Ports 11, 12, 21, 22, 23, and 24.
What is the maximum operating pressure for this component?
This protection valve is designed to operate with a maximum pressure of up to 10 BAR.
How can I verify compatibility with my braking system?
Technicians should check the opening and closing pressure requirements of the existing unit against the provided specifications for ports 21 through 24.
What are the OE reference numbers of this part?
303.02.0071 directly replaces Knorr-Bremse OE number AE4452.