303.02.0090 Compatible 4-Circuit Protection Valve
303.02.0090
Summary
This 4-circuit protection valve is engineered for heavy commercial vehicle brake systems. It features M22x1,5 and M16x1,5 port configurations with precise opening pressures of 6.3 BAR and 5.8 BAR to ensure reliable pneumatic circuit division. Compatible with Knorr-Bremse systems. Equivalent to OE Knorr-Bremse AE4409.
| EAN Code | 8683457009493 |
|---|
Ready to Order
Compatible OEM Codes
-
KNORR-BREMSE
- AE 4409
Description
What does a 4-circuit protection valve do?
This 4-circuit protection valve plays a critical role in the pneumatic brake system by dividing the air supply into separate circuits. By managing pressure distribution, it ensures that a leak in one circuit does not lead to a total loss of braking capability across the entire system. This component is manufactured using high-strength components to withstand heavy commercial vehicle operating conditions.System compatibility and technical specifications
The unit is designed to be compatible with Knorr-Bremse systems. It features specific pressure thresholds, including opening pressures of 6.3 BAR for ports 21 and 22, and 5.8 BAR for ports 23 and 24, ensuring precise pneumatic control. This valve is essential for maintaining safety standards in heavy-duty braking environments.Installation and maintenance guidance
Technicians should verify the port sizes during installation to ensure a proper fit. The device utilizes an M22x1,5 inlet port and multiple M16x1,5 outlet ports. Regular inspection of the closing pressures—maintained at approximately 3.8 BAR across all circuits—is recommended to ensure the integrity of the pneumatic lines and prevent system pressure drops.Troubleshooting and replacement
When replacing this component, ensure that all connections are tightened to specification to prevent air leaks. This part serves as a reliable replacement for maintaining optimal braking performance in complex multi-circuit configurations.OE cross-reference
303.02.0090 (4-circuit protection valve) is the equivalent of the Knorr-Bremse OE number. This part directly replaces Knorr-Bremse OE number AE4409.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 | 6,3 BAR |
| Opening Pressure 22 | 6,3 BAR |
| Opening Pressure 23 | 5,8 BAR |
| Opening Pressure 24 | 5,8 BAR |
| Closing Pressure 21 | 3,8 BAR |
| Closing Pressure 22 | 3,8 BAR |
| Closing Pressure 23 | 3,8 BAR |
| Closing Pressure 24 | 3,8 BAR |
Other OEMs
KNORR-BREMSE
- AE4409
- AE 4409
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 distinct circuits, ensuring that if one circuit fails due to a leak, the others remain pressurized for safe braking.
What are the port specifications for this valve?
This valve features an M22x1,5 inlet port and four M16x1,5 outlet ports (21, 22, 23, and 24) for precise pneumatic distribution.
How do I know if the valve needs replacement?
Technicians should look for symptoms such as abnormal pressure drops or failure to maintain the specified opening pressures of 6.3 BAR or 5.8 BAR.
Is this valve compatible with Knorr-Bremse systems?
Yes, this component is designed to be compatible with Knorr-Bremse systems in heavy commercial vehicle applications.
What are the OE reference numbers of this part?
303.02.0090 directly replaces Knorr-Bremse OE number AE4409.