303.02.0091 Compatible 4-Circuit Protection Valve
303.02.0091
Summary
This high-strength 4-circuit protection valve features M22x1.5 and M16x1.5 port configurations. It is engineered for heavy commercial vehicle brake systems, ensuring reliable pressure management with opening pressures ranging from 5.1 BAR to 6.7 BAR across its four circuits. Equivalent to OE Knorr-Bremse AE4411.
| EAN Code | 8683457009509 |
|---|
Ready to Order
Compatible OEM Codes
-
KNORR-BREMSE
- AE 4411
Description
What does a protection valve do?
This protection valve serves as a critical component within the pneumatic brake system of heavy commercial vehicles. It functions by managing air pressure distribution across multiple circuits, ensuring that a leak in one part of the system does not lead to a total loss of braking capability. Built with high-strength components, it maintains system integrity under demanding operational conditions.Compatible systems and specifications
The component is designed to be compatible with Knorr-Bremse systems and is suitable for various heavy commercial vehicle applications where precise pressure regulation is required. The unit utilizes specific port sizes, including M22x1.5 for the main inlet and M16x1.5 for the secondary outputs, to ensure secure pneumatic connections.Installation and maintenance
Technicians should verify the opening pressures during installation to ensure they match the vehicle requirements. This specific model features opening pressures of 6.7 BAR for circuits 21 and 22, and 5.8 BAR and 5.1 BAR for circuits 23 and 24 respectively. Regular inspection of the seals and port connections is recommended to prevent pressure drops.Operational pressure guidance
When replacing this unit, ensure that the mounting surfaces are clean and that all connections are torqued to specification to maintain the integrity of the pneumatic circuit.OE cross-reference
303.02.0091 (4-circuit protection valve) is the equivalent of the Knorr-Bremse OE number. This part directly replaces Knorr-Bremse OE number AE4411.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 | 6,7 BAR |
| Opening Pressure 22 | 6,7 BAR |
| Opening Pressure 23 | 5,8 BAR |
| Opening Pressure 24 | 5,1 BAR |
| Closing Pressure 21 | 4,5 BAR |
| Closing Pressure 22 | 4,5 BAR |
| Closing Pressure 23 | 4,5 BAR |
| Closing Pressure 24 | 4,5 BAR |
Other OEMs
KNORR-BREMSE
- AE4411
- AE 4411
Compatible Vehicles
| Brand | Model | Model Type | Engine |
|---|---|---|---|
| KNORR-BREMSE |
FAQ
What is the function of a 4-circuit protection valve?
It manages air pressure across four distinct circuits within a heavy commercial vehicle's brake system to prevent total pressure loss in case of a single circuit failure.
What are the port sizes for this component?
This valve is equipped with one M22x1.5 port and four M16x1.5 ports (labeled 21, 22, 23, and 24) for pneumatic connection.
How do I verify if this valve is compatible with my system?
Check the opening pressures; this model features 6.7 BAR for ports 21/22, 5.8 BAR for port 23, and 5.1 BAR for port 24.
What should I check during installation?
Ensure all M16x1.5 and M22x1.5 connections are secure and that the pressure thresholds match the technical requirements of the vehicle's braking system.
What are the OE reference numbers of this part?
303.02.0091 directly replaces Knorr-Bremse OE number AE4411.