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303.02.0021 Multi-circuit Protection Valve, Brake System

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303.02.0021 Compatible Multi-circuit Protection Valve

303.02.0021

Summary

This heavy-duty multi-circuit protection valve is designed for Renault Trucks. It features M22x1,5 and M12x1,5 port configurations with specific opening pressures of 7 BAR and 7.3 BAR to ensure pneumatic circuit stability and safety in heavy commercial vehicle brake systems. Equivalent to OE Knorr-Bremse AE4525 and Renault Trucks 5010525808.

Product identifiers
EAN Code8699031080765
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Compatible OEM Codes

  • KNORR-BREMSE
    • II37922
    • AE 4525
  • RENAULT TRUCKS
    • 5010525808

Description

What does a multi-circuit protection valve do?

This multi-circuit protection valve serves as a critical pneumatic safety component within the braking system of heavy commercial vehicles. By isolating independent air circuits, it ensures that a leak in one area does not compromise the entire system, maintaining essential braking performance for the vehicle. VADEN ORIGINAL components are engineered to provide reliable pressure regulation under demanding operating conditions.

Vehicle and system compatibility

This specific unit is compatible with Renault Trucks models. It functions effectively within complex pneumatic architectures by managing pressure across multiple outlets. It is also designed to work with systems from Knorr-Bremse to maintain high safety standards during operation.

Technical specifications and installation

The technical configuration includes M22x1,5 ports for primary connections and M12x1,5 ports for secondary lines. Technicians should verify the opening pressures—such as 7 BAR for Port 21/22 and 7.3 BAR for Port 23—to ensure correct system calibration. Regular inspection of port seals and pressure thresholds is recommended during routine maintenance to prevent pneumatic failure.

Maintenance and troubleshooting

Consult your authorized distributor.

OE cross-reference

303.02.0021 (Multi-circuit Protection Valve) is the equivalent of the Knorr-Bremse and Renault Trucks OE numbers. This part directly replaces Knorr-Bremse OE numbers AE4525, II37922. It also replaces Renault Trucks OE number 5010525808.

Technical Specifications

Technical Specifications
Port 1M22x1,5
Port 21M22x1,5
Port 22M22x1,5
Port 23M22x1,5
Port 24M22x1,5
Port 25M22x1,5
Port 26M22x1,5
Port 27M12x1,5
Port 28M12x1,5
Opening Pressure 237,3 BAR
Opening Pressure 247 BAR
Closing Pressure 21/224,5 BAR
Closing Pressure 23/244,5 BAR
Opening Pressure 21/227 BAR

Other OEMs

KNORR-BREMSE

  • AE4525
  • II37922
  • AE 4525

RENAULT TRUCKS

  • 5010525808

Related Products

Repair Kits

Compatible Vehicles

Compatible Vehicles
BrandModelModel TypeEngine
KNORR-BREMSE
RENAULT TRUCKS

FAQ

What is the function of this protection valve?
It isolates independent air circuits in a vehicle's braking system, ensuring that a leak in one circuit does not lead to a total loss of pressure in others.
Which vehicles are compatible with this part?
This component is specifically designed for use in Renault Trucks heavy commercial vehicles.
What are the port sizes for this component?
The unit features M22x1,5 ports (Ports 1 through 26) and M12x1,5 ports (Ports 27 and 28).
What are the pressure thresholds?
The valve operates with specific opening pressures, including 7 BAR for Ports 21/22 and 7.3 BAR for Port 23.
What are the OE reference numbers of this part?
303.02.0021 directly replaces Knorr-Bremse OE numbers AE4525, II37922. It also replaces Renault Trucks OE number 5010525808.