303.02.0059 Equivalent Multi-circuit Protection Valve
303.02.0059
Summary
This multi-circuit protection valve ensures pneumatic system stability with specific opening pressures of 8 BAR and closing pressures of 7.5 BAR. Featuring M16x1.5 and M22x1.5 port configurations, it is compatible with Knorr-Bremse systems to maintain braking safety in heavy commercial vehicles. Equivalent to OE Knorr-Bremse AE4503.
| EAN Code | 8683457008236 |
|---|
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Compatible OEM Codes
-
KNORR-BREMSE
- AE 4503
Description
What does a multi-circuit protection valve do?
This multi-circuit protection valve plays a critical role in the pneumatic brake system of heavy commercial vehicles. By isolating different circuits, it prevents total brake failure if a single line experiences a leak, ensuring the vehicle remains controllable under heavy loads. Built with high-strength components, it maintains consistent pressure regulation throughout the braking cycle.System compatibility and port specifications
Designed for reliability in demanding environments, this component is compatible with Knorr-Bremse systems. It features specialized port sizing, including M16x1.5 for ports 21, 22, 23, and 24, and a M22x1.5 configuration for port 26. These specifications ensure precise integration into existing pneumatic architectures.Installation and maintenance guidance
Maintenance technicians should monitor the valve's performance by checking the opening pressure at 8 BAR and closing pressure at 7.5 BAR for circuits 21/22 and 23/24. Regular inspections of the port connections and pressure thresholds are essential to prevent system-wide pressure drops and ensure optimal braking response.Troubleshooting and selection
When replacing this unit, ensure all seals are inspected to maintain the integrity of the circuit isolation. Consult your authorized distributor for fitment confirmation.OE cross-reference
303.02.0059 (Multi-circuit Protection Valve) is the equivalent of the Knorr-Bremse OE number. This part directly replaces Knorr-Bremse OE number AE4503.Technical Specifications
| Port 21 | M16x1,5 |
|---|---|
| Port 22 | M16x1,5 |
| Port 23 | M16x1,5 |
| Port 24 | M16x1,5 |
| Port 26 | M22x1,5 |
| Opening Pressure 21/22 | 8 BAR |
| Opening Pressure 23/24 | 8 BAR |
| Closing Pressure 21/22 | 7,5 BAR |
| Closing Pressure 23/24 | 7,5 BAR |
Other OEMs
KNORR-BREMSE
- AE4503
- AE 4503
Related Products
Repair Kits
Used In
Compatible Vehicles
| Brand | Model | Model Type | Engine |
|---|---|---|---|
| KNORR-BREMSE |
FAQ
What is the primary function of this multi-circuit protection valve?
It isolates pneumatic circuits within the brake system to ensure that a leak in one area does not lead to a complete loss of braking capability.
What are the specific port sizes for this component?
The valve features M16x1.5 ports (for ports 21, 22, 23, and 24) and an M22x1.5 port (for port 26).
What are the standard operating pressure thresholds?
The device operates with an opening pressure of 8 BAR and a closing pressure of 7.5 BAR for circuits 21/22 and 23/24.
Is this component compatible with Knorr-Bremse systems?
Yes, this part is designed to be compatible with Knorr-Bremse systems used in heavy commercial vehicle braking architectures.
What are the OE reference numbers of this part?
303.02.0059 directly replaces Knorr-Bremse OE number AE4503.