303.02.0094 4-Circuit Protection Valve — Knorr-Bremse compatible
303.02.0094
Summary
This 4-circuit protection valve is designed for heavy commercial vehicle brake systems. It features M22x1.5 and M16x1.5 port configurations, with opening pressures of 7 BAR and 5.7 BAR to ensure precise pneumatic control and system safety. Equivalent to OE Knorr-Bremse AE4427.
| EAN Code | 8683457009523 |
|---|
Ready to Order
Compatible OEM Codes
-
KNORR-BREMSE
- AE 4427
Description
What does a 4-circuit protection valve do?
This 4-circuit protection valve plays a critical role in the pneumatic brake system of heavy commercial vehicles. It functions by partitioning the air supply into multiple circuits, ensuring that a leak in one section does not compromise the entire braking capability. Built with high-strength components, it maintains stable pressure distribution across all lines.System compatibility and fitment
The component is compatible with Knorr-Bremse systems and other heavy-duty pneumatic architectures. It manages air flow through specific ports, including an M22x1.5 inlet and multiple M16x1.5 outlets, to maintain optimal system integrity during operation.Installation and technical specifications
For professional installation, technicians should verify the pressure settings: Port 21 and 22 operate at a 7 BAR opening pressure, while Port 23 and 24 utilize a 5.7 BAR opening pressure. Ensure all connections are secure to prevent pressure drops in the braking circuit.Maintenance and inspection
Regular inspection of the valve seating and port integrity is recommended to prevent air leaks in the pneumatic circuit.OE cross-reference
303.02.0094 (4-circuit protection valve) is the equivalent of the Knorr-Bremse OE number. This part directly replaces Knorr-Bremse OE number AE4427.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 | 7 BAR |
| Opening Pressure 22 | 7 BAR |
| Opening Pressure 23 | 5,7 BAR |
| Opening Pressure 24 | 5,7 BAR |
| Closing Pressure 21 | 4,7 BAR |
| Closing Pressure 22 | 4,7 BAR |
| Closing Pressure 23 | 4,7 BAR |
| Closing Pressure 24 | 4,7 BAR |
Other OEMs
KNORR-BREMSE
- AE4427
- AE 4427
Compatible Vehicles
| Brand | Model | Model Type | Engine |
|---|---|---|---|
| KNORR-BREMSE |
FAQ
What is the function of a 4-circuit protection valve?
It partitions the air supply into four independent circuits, ensuring that if one circuit loses pressure due to a leak, the remaining circuits continue to function for safe braking.
What are the port sizes for this valve?
The primary port is M22x1.5, while the secondary outlets feature M16x1.5 thread sizes for standard pneumatic connections.
How do the opening pressures differ between ports?
This unit features two different pressure settings: Ports 21 and 22 have a 7 BAR opening pressure, whereas Ports 23 and 24 operate at a 5.7 BAR opening pressure.
Is this component compatible with Knorr-Bremse systems?
Yes, this component is designed to be compatible with Knorr-Bremse systems within heavy commercial vehicle pneumatic braking architectures.
What are the OE reference numbers of this part?
303.02.0094 directly replaces Knorr-Bremse OE number AE4427.