303.02.0021 Multi-circuit Protection Valve
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303.02.0021 KNORR-BREMSE Multi-circuit Protection Valve

303.02.0021

Summary

The 303.02.0021 is a high-precision Multi-circuit Protection Valve designed for heavy commercial vehicle brake systems. It features multiple ports including Port 1 (M22x1,5), Port 21 (M22x1,5), and Port 27 (M12x1,5). This component is engineered for durability and is compatible with KNORR-BREMSE and RENAULT TRUCKS systems, ensuring optimal pneumatic pressure regulation.

EAN Code8699031080765
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Description

The multi-circuit protection valve serves as a critical component within the pneumatic brake system of heavy commercial vehicles, managing air pressure distribution across different circuits to ensure safety and stability. This high-strength component is designed to regulate pressure differentials, providing essential protection against sudden pressure drops in the braking system.

303.02.0021 is the OE-equivalent of the KNORR-BREMSE AE 4525 and II37922 multi-circuit protection valves used in RENAULT TRUCKS systems, including compatibility with part number 5010525808. This valve is specifically engineered to meet the rigorous demands of heavy-duty transport operations, ensuring seamless integration with existing brake architectures.

For workshop technicians, this unit features multiple M22x1,5 ports (Ports 1, 21, 22, 23, 24, 25, 26) and M12x1,5 ports (Ports 27, 28) for versatile installation. The technical specifications include an opening pressure of 7,3 BAR for Port 23 and 7 BAR for Port 24, with closing pressures optimized at 4,5 BAR for circuits 21/22 and 22/24 to maintain system integrity during operation.

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 22/244,5 BAR
Opening Pressure 21/227 BAR

Other OEMs

KNORR-BREMSE

  • AE 4525
  • II37922
  • AE4525

RENAULT TRUCKS

  • 5010525808

Related Products

Repair Kits

Vehicles Used

BrandModelEngine
KNORR-BREMSE
RENAULT TRUCKS

FAQ

Which OEM numbers are compatible with this part?
This part is compatible with KNORR-BREMSE AE 4525, KNORR-BREMSE II37922, and RENAULT TRUCKS 5010525808.
What are the port sizes for the 303.02.0021 valve?
The valve features M22x1,5 threads for Ports 1 through 26 and M12x1,5 threads for Ports 27 and 28.
What is the opening pressure for Port 23?
The opening pressure for Port 23 is specified at 7,3 BAR for optimal pneumatic performance.
Is this part suitable for heavy commercial vehicles?
Yes, this multi-circuit protection valve is designed specifically for heavy commercial vehicle brake systems.
Can this be used as a replacement for RENAULT TRUCKS parts?
Yes, it is a direct compatible replacement for the RENAULT TRUCKS part number 5010525808.