303.02.0049 Compatible 4-Circuit Protection Valve
303.02.0049
Summary
This 4-circuit protection valve ensures precise pneumatic distribution within the brake system. Featuring M22x1.5 and M16x1.5 port configurations, it operates at a maximum pressure of 20 BAR to maintain system integrity in heavy commercial vehicle applications. Equivalent to OE Knorr-Bremse AE4643.
| EAN Code | 8683457005280 |
|---|
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Compatible OEM Codes
-
KNORR-BREMSE
- AE 4643
Description
What does a 4-circuit protection valve do?
This protection valve plays a critical role in the pneumatic brake system by managing air distribution across multiple circuits. It ensures that a leak in one circuit does not lead to a total loss of braking capability, maintaining high-strength performance for heavy commercial vehicles.System compatibility and fitment
The component is designed to function within complex air brake architectures, providing essential safety through pressure regulation. It is compatible with Knorr-Bremse systems and meets the rigorous demands of heavy-duty braking environments.Technical specifications and operation
Technical specifications include a primary port of M22x1.5 and four secondary ports of M16x1.5. The unit operates with an opening pressure of 7 BAR and a closing pressure of 5 BAR for its secondary ports, supporting a maximum operating pressure of up to 20 BAR.Maintenance and inspection guidance
For optimal performance, technicians should inspect the valve during routine brake system maintenance to ensure correct opening and closing pressures are maintained.OE cross-reference
303.02.0049 (4-circuit protection valve) is the equivalent of the Knorr-Bremse OE number. This part directly replaces Knorr-Bremse OE number AE4643.Technical Specifications
| Port 1 | M22x1,5 |
|---|---|
| Port 21 | M16x1,5 |
| Port 22 | M16x1,5 |
| Port 23 | M16x1,5 |
| Port 24 | M16x1,5 |
| Operating Pressure | 13 BAR |
| Opening Pressure 21 | 7 BAR |
| Opening Pressure 22 | 7 BAR |
| Opening Pressure 23 | 7 BAR |
| Opening Pressure 24 | 7 BAR |
| Closing Pressure 21 | 5 BAR |
| Closing Pressure 22 | 5 BAR |
| Closing Pressure 23 | 5 BAR |
| Closing Pressure 24 | 5 BAR |
| Pressure | MAX 20 BAR |
Other OEMs
KNORR-BREMSE
- AE4643
- AE 4643
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 four separate circuits to prevent total system failure in the event of a leak.
What are the port specifications for this component?
The main port is M22x1.5, while the four secondary ports are M16x1.5, ensuring compatibility with standard heavy-duty fittings.
What is the maximum operating pressure?
This component is designed to operate safely up to a maximum pressure of 20 BAR within the pneumatic system.
Is this compatible with Knorr-Bremse systems?
Yes, this part is designed to be compatible with Knorr-Bremse systems used in heavy commercial vehicles.
What are the OE reference numbers of this part?
303.02.0049 directly replaces Knorr-Bremse OE number AE4643.