303.02.0042 Compatible 4-Circuit Protection Valve
303.02.0042
Summary
This 4-circuit protection valve is engineered for heavy commercial vehicle brake systems, featuring M22x1.5 and M16x1.5 port configurations. It operates at a maximum pressure of 20 BAR, ensuring reliable pressure distribution across multiple circuits to maintain braking performance. Equivalent to OE Knorr-Bremse AE4611.
| EAN Code | 8683457005211 |
|---|
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Compatible OEM Codes
-
KNORR-BREMSE
- II33856
- AE 4611
Description
What does a protection valve do?
This protection valve plays a critical role in the pneumatic brake system by managing air pressure distribution across multiple independent circuits. By isolating pressure failures, it ensures that a leak in one circuit does not compromise the entire braking capability of the vehicle, providing high-strength component reliability for workshop technicians.System compatibility and specifications
This component is compatible with Knorr-Bremse systems and is designed to handle operating pressures up to 12 BAR. It features specific opening pressures, such as 7.3 BAR for port 23 and 7 BAR for ports 21, 22, and 24, to maintain precise pneumatic control during heavy-duty operation.Installation and maintenance guidance
Installation requires careful attention to the port sizes, specifically the M22x1.5 inlet and M16x1.5 outlets, to ensure a secure seal. Technicians should verify that all connection points are free of debris and that the closing pressure remains consistent at approximately 4.5 BAR across all circuits to ensure optimal system response.Operational monitoring
Regular inspection of the valve ports and pressure settings is recommended during routine maintenance to prevent system imbalances.OE cross-reference
303.02.0042 (4-circuit protection valve) is the equivalent of the Knorr-Bremse OE numbers. This part directly replaces Knorr-Bremse OE numbers AE4611, II33856.Technical Specifications
| Port 1 | M22x1,5 |
|---|---|
| Port 21 | M16x1,5 |
| Port 22 | M16x1,5 |
| Port 23 | M16x1,5 |
| Port 24 | M16x1,5 |
| Operating Pressure | 12 BAR |
| Opening Pressure 21 | 7 BAR |
| Opening Pressure 22 | 7 BAR |
| Opening Pressure 23 | 7,3 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 |
| Pressure | MAX 20 BAR |
Other OEMs
KNORR-BREMSE
- AE4611
- II33856
- AE 4611
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 across four separate circuits, ensuring that a leak in one area does not lead to a total loss of braking power in the vehicle's pneumatic system.
What are the technical port specifications for this valve?
The unit features a primary M22x1.5 port and four secondary ports with M16x1.5 threading to accommodate standard heavy commercial vehicle air lines.
What is the maximum operating pressure allowed?
This component is designed for use in systems with an operating pressure of up to 12 BAR, with a maximum structural pressure rating of 20 BAR.
How can I identify if the valve needs replacement?
Technicians should look for inconsistent closing pressures or air leaks at the M16x1.5 ports, which may indicate internal seal wear or mechanical fatigue.
What are the OE reference numbers of this part?
303.02.0042 directly replaces Knorr-Bremse OE numbers AE4611, II33856.