303.02.0069 Compatible 4-Circuit Protection Valve
303.02.0069
Summary
This 4-circuit protection valve is designed for heavy commercial vehicle brake systems. It features M22x1.5 and M16x1.5 port configurations, with a maximum operating pressure of 20 BAR, ensuring reliable pneumatic circuit division and safety. Equivalent to OE Knorr-Bremse AE4421.
| EAN Code | 8683457009288 |
|---|
Ready to Order
Compatible OEM Codes
-
KNORR-BREMSE
- AE 4421
Description
This protection valve plays a critical role in the pneumatic brake system by dividing the air supply into multiple independent circuits. By isolating pressure drops in one circuit from others, it ensures that even if a single line fails, the remaining circuits maintain sufficient pressure for safe operation. This component is engineered with high-strength components to withstand heavy-duty commercial vehicle demands.
The unit is compatible with Knorr-Bremse systems and is designed for integration into complex pneumatic networks. It manages various pressure thresholds, including specific opening pressures of 7.6 BAR and 6.7 BAR for different ports, to ensure precise air distribution across the vehicle's braking infrastructure.
Technicians should verify all port connections, specifically the M22x1.5 and M16x1.5 threads, during installation to prevent leaks. Regular inspections of the opening and closing pressures—ranging from 4.3 BAR to 5.5 BAR depending on the port—are essential for maintaining optimal braking performance and system safety.
Consult your authorized distributor to ensure correct fitment for your specific pneumatic configuration.
The unit is compatible with Knorr-Bremse systems and is designed for integration into complex pneumatic networks. It manages various pressure thresholds, including specific opening pressures of 7.6 BAR and 6.7 BAR for different ports, to ensure precise air distribution across the vehicle's braking infrastructure.
Technicians should verify all port connections, specifically the M22x1.5 and M16x1.5 threads, during installation to prevent leaks. Regular inspections of the opening and closing pressures—ranging from 4.3 BAR to 5.5 BAR depending on the port—are essential for maintaining optimal braking performance and system safety.
Consult your authorized distributor to ensure correct fitment for your specific pneumatic configuration.
OE cross-reference
303.02.0069 (4-circuit protection valve) is the equivalent of the Knorr-Bremse OE number. This part directly replaces Knorr-Bremse OE number AE4421.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 20 BAR |
| Opening Pressure 21 | 7,6 BAR |
| Opening Pressure 22 | 7,6 BAR |
| Opening Pressure 23 | 6,7 BAR |
| Opening Pressure 24 | 6,7 BAR |
| Closing Pressure 21 | 4,3 BAR |
| Closing Pressure 22 | 4,3 BAR |
| Closing Pressure 23 | 5,5 BAR |
| Closing Pressure 24 | 5,5 BAR |
Other OEMs
KNORR-BREMSE
- AE4421
- AE 4421
Related Products
Repair Kits
Compatible Vehicles
| Brand | Model | Model Type | Engine |
|---|---|---|---|
| KNORR-BREMSE |
FAQ
What is the main function of this protection valve?
It divides the air supply into four independent circuits, ensuring that a leak in one area does not compromise the entire braking system's ability to stop the vehicle.
What are the port specifications for this component?
The valve features one M22x1.5 port and multiple M16x1.5 ports to facilitate standardized connections within heavy commercial vehicle pneumatic systems.
What is the maximum operating pressure?
This component is rated for a maximum operating pressure of up to 20 BAR within the pneumatic braking circuit.
How can I identify if a replacement is needed?
Technicians should check for irregular opening/closing pressures or air leaks at the M22 or M16 ports during routine system inspections.
What are the OE reference numbers of this part?
303.02.0069 directly replaces Knorr-Bremse OE number AE4421.