303.02.0084 Compatible 4-Circuit Protection Valve
303.02.0084
Summary
This 4-circuit protection valve ensures pneumatic system stability with M22x1.5 and M16x1.5 port configurations. It features precise opening pressures of 6.5 BAR and 6 BAR to maintain optimal braking performance in heavy commercial vehicle air brake systems. Equivalent to OE Knorr-Bremse AE4405.
| EAN Code | 8683457009431 |
|---|
Ready to Order
Compatible OEM Codes
-
KNORR-BREMSE
- AE 4405
Description
This protection valve plays a critical role in maintaining the integrity of the pneumatic braking system by dividing the air supply into independent circuits. By isolating pressure drops in one circuit, it ensures that the remaining circuits continue to function effectively, providing essential safety for heavy commercial vehicles.
The component is designed to work within complex braking architectures and is compatible with Knorr-Bremse systems. Its precise operation is defined by specific pressure thresholds, including opening pressures of 6.5 BAR for Port 21 and 22, and 6 BAR for Ports 23 and 24, ensuring reliable pressure distribution across the vehicle's pneumatic lines.
For proper installation, technicians should verify that all port connections—M22x1.5 and M16x1.5—are seated correctly to prevent air leaks. Regular inspection of the closing pressures, which are maintained at approximately 4.8 BAR across all ports, is recommended during routine fleet maintenance to ensure system responsiveness.
Consult your authorized distributor to ensure this component meets your specific technical requirements.
The component is designed to work within complex braking architectures and is compatible with Knorr-Bremse systems. Its precise operation is defined by specific pressure thresholds, including opening pressures of 6.5 BAR for Port 21 and 22, and 6 BAR for Ports 23 and 24, ensuring reliable pressure distribution across the vehicle's pneumatic lines.
For proper installation, technicians should verify that all port connections—M22x1.5 and M16x1.5—are seated correctly to prevent air leaks. Regular inspection of the closing pressures, which are maintained at approximately 4.8 BAR across all ports, is recommended during routine fleet maintenance to ensure system responsiveness.
Consult your authorized distributor to ensure this component meets your specific technical requirements.
OE cross-reference
303.02.0084 (4-circuit protection valve) is the equivalent of the Knorr-Bremse OE number. This part directly replaces Knorr-Bremse OE number AE4405.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 | 6,5 BAR |
| Opening Pressure 22 | 6,5 BAR |
| Opening Pressure 23 | 6 BAR |
| Opening Pressure 24 | 6 BAR |
| Closing Pressure 21 | 4,8 BAR |
| Closing Pressure 22 | 4,8 BAR |
| Closing Pressure 23 | 4,8 BAR |
| Closing Pressure 24 | 4,8 BAR |
Other OEMs
KNORR-BREMSE
- AE4405
- AE 4405
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 divides the air supply into four independent circuits, ensuring that a leak in one circuit does not cause a total loss of braking capability in the others.
What are the port sizes for this component?
This valve features one M22x1.5 port and three M16x1.5 ports to accommodate standard heavy commercial vehicle pneumatic connections.
What are the typical operating pressures?
The device operates with opening pressures ranging from 6 BAR to 6.5 BAR and maintains closing pressures at approximately 4.8 BAR across all circuits.
Is this component compatible with Knorr-Bremse systems?
Yes, this part is designed to be compatible with Knorr-Bremse systems used in heavy commercial vehicle braking architectures.
What are the OE reference numbers of this part?
303.02.0084 directly replaces Knorr-Bremse OE number AE4405.