303.02.0078 Compatible 4-Circuit Protection Valve
303.02.0078
Summary
This 4-circuit protection valve is designed for heavy-duty brake systems. Featuring M22x1,5 and M16x1,5 port configurations, it ensures reliable pressure regulation with 7 BAR opening and 4.5 BAR closing pressures across all circuits. Compatible with Knorr-Bremse systems. Equivalent to OE Knorr-Bremse AE4180.
| EAN Code | 8683457009370 |
|---|
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Compatible OEM Codes
-
KNORR-BREMSE
- AE 4180
Description
What does a protection valve do?
This protection valve plays a critical role in maintaining pneumatic circuit integrity within heavy commercial vehicle brake systems. By isolating air circuits, it prevents a leak in one section from causing a total system failure, ensuring consistent braking performance. The component is manufactured using high-strength components to withstand demanding operational environments.System compatibility and fitment
This part is engineered to be compatible with Knorr-Bremse systems. It functions effectively within complex pneumatic networks where precise pressure regulation is required for safety. The design ensures stable air distribution across the multiple circuits of the vehicle's braking assembly.Installation and maintenance
For proper installation, technicians should verify that all ports—including the M22x1,5 inlet and M16x1,5 outlets—are free of debris. It is essential to check that the opening pressure of 7 BAR and closing pressure of 4.5 BAR align with the specific system requirements of the heavy commercial vehicle during assembly.System reliability
Regular inspection of the valve's ports and pressure thresholds can help prevent unexpected pneumatic failures. Ensuring correct mounting and seal integrity is vital for maintaining the high-strength performance required in heavy commercial vehicle braking applications.OE cross-reference
303.02.0078 (4-circuit protection valve) is the equivalent of the Knorr-Bremse OE number. This part directly replaces Knorr-Bremse OE number AE4180.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 | 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
- AE4180
- AE 4180
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 isolates different air circuits within the brake system to ensure that a leak in one circuit does not lead to a complete loss of air pressure in others.
What are the port specifications for this valve?
This valve features one M22x1,5 port and four M16x1,5 ports for circuit distribution.
What are the pressure operating limits?
The valve is designed with an opening pressure of 7 BAR and a closing pressure of 4.5 BAR for all four circuits.
Is this component compatible with Knorr-Bremse?
Yes, this protection valve is designed to be compatible with Knorr-Bremse systems.
What are the OE reference numbers of this part?
303.02.0078 directly replaces Knorr-Bremse OE number AE4180.