303.02.0072 Compatible 4-Circuit Protection Valve
303.02.0072
Summary
This heavy-duty 4-circuit protection valve is designed for brake system safety. It features M22x1.5 and M16x1.5 port configurations with precise opening pressures of 7 BAR and closing pressures of 5 BAR to ensure reliable pneumatic circuit management in heavy commercial vehicles. Equivalent to OE Knorr-Bremse AE4158.
| EAN Code | 8683457009318 |
|---|
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Compatible OEM Codes
-
KNORR-BREMSE
- AE 4158
Description
What does a 4-circuit protection valve do?
This protection valve plays a critical role in the pneumatic brake system by dividing the air supply into four independent circuits. By isolating individual lines, it ensures that a leak in one circuit does not lead to a total loss of braking capability, maintaining safety for the vehicle during operation.Compatibility and technical specifications
Designed for high-reliability applications, this component is compatible with Knorr-Bremse systems. It features a primary M22x1.5 port and four secondary M16x1.5 ports, ensuring precise pressure regulation across all connected lines.Installation and maintenance guidance
Technicians should verify that the opening pressure of 7 BAR and closing pressure of 5 BAR align with the specific system requirements during installation. Regular inspection of the port connections is recommended to maintain optimal pneumatic integrity within the braking assembly.System reliability and selection
Selecting the correct valve prevents system-wide pressure drops and ensures consistent performance under heavy load conditions.OE cross-reference
303.02.0072 (4-circuit protection valve) is the equivalent of the Knorr-Bremse OE number. This part directly replaces Knorr-Bremse OE number AE4158.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 | 7 BAR |
| Opening Pressure 24 | 7 BAR |
| Closing Pressure 21 | 5 BAR |
| Closing Pressure 22 | 5 BAR |
| Closing Pressure 23 | 5 BAR |
| Closing Pressure 24 | 5 BAR |
Other OEMs
KNORR-BREMSE
- AE4158
- AE 4158
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 manages air distribution by splitting the supply into four separate circuits, ensuring that a single leak does not compromise the entire braking system.
What are the port specifications for this component?
This valve features one M22x1.5 port and four M16x1.5 ports for connection to the pneumatic lines.
What are the pressure thresholds for this valve?
The component operates with an opening pressure of 7 BAR and a closing pressure of 5 BAR across its circuits.
Which systems is this valve compatible with?
This part is designed to be compatible with Knorr-Bremse systems used in heavy commercial vehicles.
What are the OE reference numbers of this part?
303.02.0072 directly replaces Knorr-Bremse OE number AE4158.