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303.02.0057 Multi-circuit Protection Valve, Brake System

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303.02.0057 Compatible Knorr-Bremse Protection Valve

303.02.0057

Summary

This multi-circuit protection valve is engineered for heavy commercial vehicle brake systems. It features M16x1,5 and M22x1,5 ports, ensuring precise pressure regulation with opening pressures of 7,5 BAR and closing pressures of 6 BAR to maintain braking safety. Equivalent to OE Knorr-Bremse AE4562.

Product identifiers
EAN Code8683457006270
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Compatible OEM Codes

  • KNORR-BREMSE
    • K050701N50
    • K050701N00
    • AE 4562

Description

What does a protection valve do?

This multi-circuit protection valve plays a critical role in the pneumatic brake system of heavy commercial vehicles. By managing air pressure distribution across different circuits, it ensures that a leak in one section does not compromise the entire braking capability of the vehicle. Built with high-strength components, this valve provides reliable pressure regulation and circuit isolation for demanding service conditions.

Technical specifications and compatibility

This component is designed to be compatible with Knorr-Bremse systems. It features specific port configurations including M16x1,5 (Ports 21, 22, 23, 24) and M22x1,5 (Ports 25, 26, 28) to ensure precise pneumatic connections. The technical performance includes opening pressures of 7,5 BAR for ports 21, 22, and 23, while maintaining closing pressures at 6 BAR for all specified circuits.

Installation and maintenance guidance

For workshop technicians performing maintenance, it is essential to verify all port sizes and pressure thresholds before installation. Proper mounting ensures that the valve maintains its ability to isolate circuits effectively during pressure drops. Regular inspection of the connection points is recommended to prevent air leaks in the pneumatic lines.

System reliability and performance

Ensuring the correct pressure settings is vital for the overall safety of the vehicle's braking performance. This valve provides consistent response times to maintain stable air pressure throughout the pneumatic system.

OE cross-reference

303.02.0057 (Multi-circuit Protection Valve) is the equivalent of the Knorr-Bremse OE numbers. This part directly replaces Knorr-Bremse OE numbers AE4562, K050701N00, K050701N50.

Technical Specifications

Technical Specifications
Port 21M16x1,5
Port 22M16x1,5
Port 23M16x1,5
Port 24M16x1,5
Port 26M22x1,5
Opening Pressure 247,4 BAR
Closing Pressure 21/226 BAR
Closing Pressure 23/246 BAR
Port 25M22x1,5
Port 28M22x1,5
Opening Pressure 217,5 BAR
Opening Pressure 227,5 BAR
Opening Pressure 237,5 BAR

Other OEMs

KNORR-BREMSE

  • K050701N50
  • K050701N00
  • AE 4562

Related Products

Repair Kits

Compatible Vehicles

Compatible Vehicles
BrandModelModel TypeEngine
KNORR-BREMSE

FAQ

What is the primary function of this protection valve?
It serves to protect the pneumatic brake system by isolating individual circuits in case of a leak, ensuring continued braking performance.
What are the port specifications for this component?
The valve features multiple connections including M16x1,5 for ports 21 through 24 and M22x1,5 for ports 25, 26, and 28.
How do the pressure thresholds operate?
The unit is designed with opening pressures around 7,5 BAR and closing pressures at approximately 6 BAR to maintain optimal circuit stability.
Which systems is this component compatible with?
This component is specifically designed for use within Knorr-Bremse systems in heavy commercial vehicle applications.
What are the OE reference numbers of this part?
303.02.0057 directly replaces Knorr-Bremse OE numbers AE4562, K050701N00, K050701N50.