303.02.0087 Compatible 4-Circuit Protection Valve
303.02.0087
Summary
This 4-circuit protection valve is designed for heavy commercial vehicle brake systems. It features M22x1.5 and M16x1.5 port configurations with precise opening pressures of 5.5 BAR and closing pressures of 4.5 BAR to ensure pneumatic system integrity. Equivalent to OE Knorr-Bremse AE4191.
| EAN Code | 8683457009462 |
|---|
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Compatible OEM Codes
-
KNORR-BREMSE
- AE 4191
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. By dividing the air supply into multiple independent circuits, it ensures that a leak in one part of the system does not lead to a total loss of braking capability, maintaining essential safety standards during operation.System compatibility and performance
This component is compatible with Knorr-Bremse systems and is engineered to withstand the high-pressure demands of heavy-duty braking environments. It provides stable air distribution to ensure consistent performance across all active pneumatic lines.Technical specifications and installation
The valve features a primary M22x1.5 port alongside four M16x1.5 ports, specifically calibrated with an opening pressure of 5.5 BAR and a closing pressure of 4.5 BAR for each circuit. Technicians should inspect all port connections and pressure settings during routine maintenance to prevent system imbalances.Maintenance and troubleshooting
Regular checks of the pneumatic lines connected to this valve are recommended to ensure optimal pressure regulation and prevent air leakage within the braking circuit.OE cross-reference
303.02.0087 (4-circuit protection valve) is the equivalent of the Knorr-Bremse OE number. This part directly replaces Knorr-Bremse OE number AE4191.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 | 5,5 BAR |
| Opening Pressure 22 | 5,5 BAR |
| Opening Pressure 23 | 5,5 BAR |
| Opening Pressure 24 | 5,5 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
- AE4191
- AE 4191
Compatible Vehicles
| Brand | Model | Model Type | Engine |
|---|---|---|---|
| KNORR-BREMSE |
FAQ
What is the function of a 4-circuit protection valve?
It divides the air supply into four independent circuits to ensure that a single leak does not compromise the entire braking system's functionality.
What are the port specifications for this valve?
The unit is equipped with one M22x1.5 port and four M16x1.5 ports to accommodate standard pneumatic connections in heavy vehicle systems.
What are the operating pressure ranges?
The valve operates with a specified opening pressure of 5.5 BAR and a closing pressure of 4.5 BAR for each of its four circuits.
Which brands is this component compatible with?
This protection valve is designed to be compatible with Knorr-Bremse systems found in various heavy commercial vehicle applications.
What are the OE reference numbers of this part?
303.02.0087 directly replaces Knorr-Bremse OE number AE4191.