303.02.0070 Compatible 4-Circuit Protection Valve
303.02.0070
Summary
This 4-circuit protection valve is designed for heavy commercial vehicle brake systems. It features M22x1.5 and M16x1.5 port configurations, with specific opening pressures ranging from 6.9 BAR to 7.5 BAR to ensure precise pneumatic pressure regulation. Equivalent to OE Knorr-Bremse AE4448.
| EAN Code | 8683457009295 |
|---|
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Compatible OEM Codes
-
KNORR-BREMSE
- AE 4448
Description
What does a 4-circuit protection valve do?
This protection valve plays a critical role in the pneumatic brake system of heavy commercial vehicles by dividing the air supply into multiple circuits. By isolating pressure levels, it ensures that a leak in one circuit does not compromise the entire braking capability of the vehicle, maintaining high-strength performance under heavy loads.System compatibility and fitment
This component is designed to function within professional pneumatic systems and is compatible with Knorr-Bremse systems. It provides reliable pressure management across various circuits, ensuring that braking force remains consistent across the vehicle's air lines.Installation and maintenance guidance
For proper installation, technicians should verify the port sizes, specifically the M22x1.5 and M16x1.5 connections, and ensure all lines are clear of debris. Monitoring opening pressures—such as the 6.9 BAR for ports 21 and 22 or up to 7.5 BAR for port 24—is essential for maintaining system integrity during routine maintenance.Pressure regulation and troubleshooting
Consult your authorized distributor.OE cross-reference
303.02.0070 (4-circuit protection valve) is the equivalent of the Knorr-Bremse OE number. This part directly replaces Knorr-Bremse OE number AE4448.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
- AE4448
- AE 4448
Related Products
Repair Kits
Compatible Vehicles
| Brand | Model | Model Type | Engine |
|---|---|---|---|
| KNORR-BREMSE |
FAQ
What is the function of this protection valve?
It manages air pressure distribution across multiple circuits in a pneumatic brake system to prevent total pressure loss in case of a single circuit leak.
Which port sizes are used on this component?
The unit features one M22x1.5 port and several M16x1.5 ports for circuit distribution.
What are the typical operating pressures?
The maximum pressure is 10 BAR, with specific opening pressures ranging between 6.9 BAR and 7.5 BAR depending on the circuit.
Is this compatible with Knorr-Bremse systems?
Yes, this component is designed to be compatible with Knorr-Bremse systems.
What are the OE reference numbers of this part?
303.02.0070 directly replaces Knorr-Bremse OE number AE4448.