303.02.0050 Compatible 4-Circuit Protection Valve
303.02.0050
Summary
This 4-circuit protection valve is engineered for heavy commercial vehicle braking systems. It features M22x1.5 and M16x1.5 port configurations, an operating pressure of 13 BAR, and specific opening/closing pressures of 7 BAR and 5.5 BAR respectively to ensure precise pneumatic control. Equivalent to OE Knorr-Bremse AE4644.
| EAN Code | 8683457005297 |
|---|
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Compatible OEM Codes
-
KNORR-BREMSE
- K019907N00
- AE 4644
Description
What does a protection valve do?
This protection valve serves as a critical component within the pneumatic braking system, ensuring that air pressure is distributed correctly across multiple circuits. By isolating different brake circuits, it prevents a single leak from causing a total loss of braking capability, maintaining high-strength performance in heavy commercial vehicles.System compatibility and ports
This component is compatible with Knorr-Bremse systems and is designed to meet rigorous industrial standards. It features a primary M22x1.5 port and four secondary M16x1.5 ports, allowing for organized pneumatic distribution across the vehicle's chassis or trailer air lines.Installation and pressure specifications
For workshop technicians, verifying the pressure settings is essential during installation. This unit operates at a maximum pressure of 20 BAR, with specific opening pressures set at 7 BAR and closing pressures at 5.5 BAR for ports 21 through 24 to ensure reliable circuit isolation.Maintenance and troubleshooting
Regular inspection of the port connections and pressure regulation ensures the longevity of the entire braking system. Consult your authorized distributor to ensure this part meets your specific technical requirements.OE cross-reference
303.02.0050 (4-circuit protection valve) is the equivalent of the Knorr-Bremse OE numbers. This part directly replaces Knorr-Bremse OE numbers AE4644, K019907N00.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 | 5,5 BAR |
| Closing Pressure 22 | 5,5 BAR |
| Closing Pressure 23 | 5,5 BAR |
| Closing Pressure 24 | 5,5 BAR |
| Pressure | MAX 20 BAR |
Other OEMs
KNORR-BREMSE
- AE4644
- K019907N00
- AE 4644
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 separate circuits, ensuring that if one circuit fails due to a leak, the remaining circuits still provide sufficient braking force.
What are the port sizes for this component?
The main port is M22x1.5, while the four secondary ports are M16x1.5, allowing for standardized connection in heavy vehicle pneumatic systems.
What are the operating pressure limits?
The device has an operating pressure of 13 BAR and can handle a maximum pressure of up to 20 BAR for safe operation.
How do I know if the protection valve is working correctly?
Technicians should monitor if opening pressures hold at 7 BAR and closing pressures trigger at 5.5 BAR across all four secondary ports.
What are the OE reference numbers of this part?
303.02.0050 directly replaces Knorr-Bremse OE numbers AE4644, K019907N00.