303.02.0045 Compatible 4-Circuit Protection Valve
303.02.0045
Summary
This 4-circuit protection valve ensures critical pneumatic distribution within heavy commercial vehicle brake systems. Featuring M22x1.5 and M16x1.5 ports, it operates at 12 BAR to maintain system integrity. Compatible with Knorr-Bremse systems. Equivalent to OE Knorr-Bremse AE4619.
| EAN Code | 8683457005242 |
|---|
Ready to Order
Compatible OEM Codes
-
KNORR-BREMSE
- II39775F
- AE 4619
Description
What does a 4-circuit protection valve do?
This protection valve plays a vital role in the pneumatic brake system by dividing the air supply into four independent circuits. By managing pressure distribution, it prevents a single leak from compromising the entire braking capability of the vehicle. It is manufactured with high-strength components to withstand constant pressure fluctuations.System compatibility and application
The unit is designed for heavy commercial vehicle applications and is compatible with Knorr-Bremse systems. Its precise internal design ensures that pressure is diverted correctly during system changes, maintaining stability across all active lines.Installation and maintenance guidance
For proper maintenance, technicians should verify the opening and closing pressures at each port, which range from 4.5 BAR to 7.4 BAR depending on the circuit. Ensure all M16x1.5 and M22x1.5 connections are secure to prevent air loss during operation.Troubleshooting and performance
Regular inspection of the valve body and port seals is recommended to prevent pressure drops in the main service lines.OE cross-reference
303.02.0045 (4-circuit protection valve) is the equivalent of the Knorr-Bremse OE numbers. This part directly replaces Knorr-Bremse OE numbers AE4619, II39775F.Technical Specifications
| Port 1 | M22x1,5 |
|---|---|
| Port 21 | M16x1,5 |
| Port 22 | M16x1,5 |
| Port 23 | M16x1,5 |
| Port 24 | M16x1,5 |
| Operating Pressure | 12 BAR |
| Opening Pressure 21 | 7,2 BAR |
| Opening Pressure 22 | 7,4 BAR |
| Opening Pressure 23 | 6,3 BAR |
| Opening Pressure 24 | 7 BAR |
| Closing Pressure 21 | 5,5 BAR |
| Closing Pressure 22 | 5,5 BAR |
| Closing Pressure 23 | 4,5 BAR |
| Closing Pressure 24 | 5,5 BAR |
| Pressure | MAX 20 BAR |
Other OEMs
KNORR-BREMSE
- AE4619
- II39775F
- AE 4619
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 line fails, the remaining circuits maintain enough pressure for safe braking.
What are the technical port specifications?
This valve features one M22x1.5 port and four M16x1.5 ports, designed for reliable pneumatic connections in heavy commercial vehicles.
What is the maximum operating pressure?
The component is designed for an operating pressure of 12 BAR, with a maximum pressure rating of up to 20 BAR.
How can I identify a faulty protection valve?
Technicians should look for pressure drops in specific circuits or observe if opening/closing pressures deviate from standard values like 7.2 BAR or 5.5 BAR.
What are the OE reference numbers of this part?
303.02.0045 directly replaces Knorr-Bremse OE numbers AE4619, II39775F.