303.02.0076 Compatible 4-Circuit Protection Valve
303.02.0076
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 7.9 BAR and closing pressures of 6.4 BAR for precise pneumatic control. Equivalent to OE Knorr-Bremse AE4177.
| EAN Code | 8683457009356 |
|---|
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Compatible OEM Codes
-
KNORR-BREMSE
- AE 4177
Description
What does a 4-circuit protection valve do?
This 4-circuit protection valve serves as a critical component within the pneumatic brake system of heavy commercial vehicles. It is engineered to manage air pressure distribution across multiple circuits, ensuring that a leak in one area does not compromise the entire braking capability of the vehicle. Built with high-strength components, it provides the durability required for demanding transport environments.System compatibility and function
This component is compatible with Knorr-Bremse systems and is designed to meet strict industrial standards for pneumatic reliability. It ensures consistent pressure regulation across all operational circuits, maintaining safety during heavy loads.Installation and maintenance guidance
For proper installation, technicians should verify that all port connections—including the M22x1.5 inlet and M16x1.5 outlets—are properly seated to prevent air leaks. Monitoring the opening pressure of 7.9 BAR and closing pressure of 6.4 BAR is essential during routine system inspections to ensure optimal performance.Troubleshooting and inspection
Regular inspection of the valve helps in preventing sudden pressure drops in the braking system. Consult your authorized distributor for further technical guidance.OE cross-reference
303.02.0076 (4-circuit protection valve) is the equivalent of the Knorr-Bremse OE number. This part directly replaces Knorr-Bremse OE number AE4177.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 | 7,9 BAR |
| Opening Pressure 22 | 7,9 BAR |
| Opening Pressure 23 | 7,9 BAR |
| Opening Pressure 24 | 7,9 BAR |
| Closing Pressure 21 | 6,4 BAR |
| Closing Pressure 22 | 6,4 BAR |
| Closing Pressure 23 | 6,4 BAR |
| Closing Pressure 24 | 6,4 BAR |
Other OEMs
KNORR-BREMSE
- AE4177
- AE 4177
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 pressure distribution across four separate circuits, ensuring that a failure in one circuit does not lead to a total loss of braking pressure.
What are the port specifications for this valve?
The unit features one M22x1.5 port and four M16x1.5 ports to accommodate standard pneumatic connections in heavy commercial vehicles.
What are the standard operating pressures?
The valve operates with an opening pressure of 7.9 BAR and a closing pressure of 6.4 BAR across its designated ports.
How can I identify if the valve needs replacement?
Technicians should check for significant air leaks or an inability to maintain the required 7.9 BAR opening pressure during system testing.
What are the OE reference numbers of this part?
303.02.0076 directly replaces Knorr-Bremse OE number AE4177.