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303.02.0051 4-circuit protection valve, Brake System

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303.02.0051 Compatible 4-Circuit Protection Valve

303.02.0051

Summary

This 4-circuit protection valve is designed for heavy commercial vehicle brake systems. Featuring M22x1.5 and M16x1.5 port configurations, it operates at a maximum pressure of 20 BAR to ensure precise pneumatic control and system safety for heavy-duty applications. Equivalent to OE Knorr-Bremse AE4645.

Product identifiers
EAN Code8683457005303
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Compatible OEM Codes

  • KNORR-BREMSE
    • K019908
    • AE 4645

Description

What does a 4-circuit protection valve do?

This 4-circuit protection valve plays a critical role in maintaining pneumatic pressure distribution within the braking system. By isolating different circuits, it prevents total pressure loss in the event of a leak, ensuring that the vehicle maintains braking capability across essential lines. Built with high-strength components, it is designed to withstand rigorous operating conditions in heavy commercial vehicles.

Compatibility and system application

This component is compatible with Knorr-Bremse systems and is suitable for various heavy commercial vehicle applications. It maintains stable operation with an opening pressure of 7 BAR and a closing pressure of 4.5 BAR across ports 21 through 24, providing reliable circuit separation for the braking system.

Installation and maintenance

For professional installation, ensure all port connections are secure, specifically the M22x1.5 inlet and the M16x1.5 outlets. Technicians should verify that the system pressure does not exceed the maximum rating of 20 BAR during testing to maintain component integrity and long-term reliability.

Operational performance

Regular inspection of the valve ports and seals is recommended during routine brake system maintenance to prevent air leaks and ensure optimal pneumatic performance.

OE cross-reference

303.02.0051 (4-circuit protection valve) is the equivalent of the Knorr-Bremse OE numbers. This part directly replaces Knorr-Bremse OE numbers AE4645, K019908.

Technical Specifications

Technical Specifications
Port 1M22x1,5
Port 21M16x1,5
Port 22M16x1,5
Port 23M16x1,5
Port 24M16x1,5
Operating Pressure13 BAR
Opening Pressure 217 BAR
Opening Pressure 227 BAR
Opening Pressure 237 BAR
Opening Pressure 247 BAR
Closing Pressure 214,5 BAR
Closing Pressure 224,5 BAR
Closing Pressure 234,5 BAR
Closing Pressure 244,5 BAR
PressureMAX 20 BAR

Other OEMs

KNORR-BREMSE

  • AE4645
  • K019908
  • AE 4645

Related Products

Repair Kits

Compatible Vehicles

Compatible Vehicles
BrandModelModel TypeEngine
KNORR-BREMSE

FAQ

What is the function of a 4-circuit protection valve?
It isolates pneumatic circuits within the brake system to ensure that a leak in one area does not cause a complete loss of braking pressure throughout the entire vehicle.
What are the technical port specifications for this valve?
The unit features one M22x1.5 port and four M16x1.5 ports, designed to manage specific pressure thresholds for air distribution.
What is the maximum operating pressure for this component?
This protection valve is rated for a maximum operating pressure of 20 BAR to ensure safe and reliable performance in heavy commercial vehicles.
How do I know when to replace the protection valve?
Technicians should look for signs of air leaks at the M16 or M22 ports or observe if the system fails to maintain the required opening/closing pressures.
What are the OE reference numbers of this part?
303.02.0051 directly replaces Knorr-Bremse OE numbers AE4645, K019908.