303.02.0089 Compatible 4-Circuit Protection Valve
303.02.0089
Summary
This 4-circuit protection valve ensures pneumatic stability in heavy commercial vehicle brake systems. It features M22x1.5 and M16x1.5 port configurations, with opening pressures of 7 BAR and 5.7 BAR to maintain system integrity under heavy-duty conditions. Equivalent to OE Knorr-Bremse AE4408.
| EAN Code | 8683457009486 |
|---|
Ready to Order
Compatible OEM Codes
-
KNORR-BREMSE
- AE 4408
Description
This protection valve plays a critical role in the pneumatic brake system of heavy commercial vehicles by managing air distribution across multiple circuits. By isolating pressure drops, it ensures that a leak in one circuit does not compromise the entire braking performance, providing essential safety for the vehicle. It is manufactured using high-strength components to withstand constant pressure fluctuations.
This component is designed for compatibility with Knorr-Bremse systems and is suitable for various heavy commercial vehicle applications. It provides precise control through specific opening pressures, including 7 BAR for ports 21 and 22, and 5.7 BAR for ports 23 and 24, ensuring reliable circuit separation during operation.
Technicians should verify the port sizes (M22x1.5 and M16x1.5) and pressure settings before installation to ensure correct system calibration. Regular inspection of the valve body and connections is recommended to prevent air leaks and ensure consistent braking response across all four circuits.
Consult your authorized distributor.
This component is designed for compatibility with Knorr-Bremse systems and is suitable for various heavy commercial vehicle applications. It provides precise control through specific opening pressures, including 7 BAR for ports 21 and 22, and 5.7 BAR for ports 23 and 24, ensuring reliable circuit separation during operation.
Technicians should verify the port sizes (M22x1.5 and M16x1.5) and pressure settings before installation to ensure correct system calibration. Regular inspection of the valve body and connections is recommended to prevent air leaks and ensure consistent braking response across all four circuits.
Consult your authorized distributor.
OE cross-reference
303.02.0089 (4-circuit protection valve) is the equivalent of the Knorr-Bremse OE number. This part directly replaces Knorr-Bremse OE number AE4408.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 | 5,7 BAR |
| Opening Pressure 24 | 5,7 BAR |
| Closing Pressure 21 | 4,7 BAR |
| Closing Pressure 22 | 4,7 BAR |
| Closing Pressure 23 | 4,7 BAR |
| Closing Pressure 24 | 4,7 BAR |
Other OEMs
KNORR-BREMSE
- AE4408
- AE 4408
Compatible Vehicles
| Brand | Model | Model Type | Engine |
|---|---|---|---|
| KNORR-BREMSE |
FAQ
What is the function of a 4-circuit protection valve?
It manages air distribution within the brake system, isolating individual circuits to prevent total pressure loss if a leak occurs in one part of the system.
What are the port specifications for this valve?
The unit features one M22x1.5 port and four M16x1.5 ports to accommodate standard pneumatic connections.
What are the operating pressure settings?
This valve operates with opening pressures of 7 BAR for ports 21/22 and 5.7 BAR for ports 23/24, with closing pressures at 4.7 BAR.
How can I ensure compatibility with my vehicle?
Check that your current system requires these specific port sizes and pressure thresholds; consult your authorized distributor for fitment verification.
What are the OE reference numbers of this part?
303.02.0089 directly replaces Knorr-Bremse OE number AE4408.