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303.02.0098 4-circuit protection valve, Brake System
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303.02.0098 Compatible 4-Circuit Protection Valve

303.02.0098

Summary

This 4-circuit protection valve is designed for heavy commercial vehicle brake systems. It features M22x1.5 and M16x1.5 port sizes, with opening pressures of 6.5 BAR and closing pressures of 4.5 BAR across all circuits to ensure reliable pressure management. Equivalent to OE Knorr-Bremse AE4459.

Product identifiers
EAN Code8683457009561
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Compatible OEM Codes

  • KNORR-BREMSE
    • AE 4459

Description

What does a 4-circuit protection valve do?

This 4-circuit protection valve plays a critical role in the pneumatic brake system by dividing the air supply into independent circuits. By managing air pressure distribution, it ensures that a leak in one circuit does not compromise the entire braking performance, maintaining safety for heavy commercial vehicles.

System compatibility and technical specifications

This component is compatible with Knorr-Bremse systems and is engineered to withstand rigorous operating conditions. It features a primary M22x1.5 port and four secondary M16x1.5 ports, ensuring precise air flow regulation across all designated paths.

Installation and maintenance guidance

For proper installation, technicians should verify that the opening pressure of 6.5 BAR and closing pressure of 4.5 BAR align with the specific vehicle requirements. Regular inspection of the port connections and seals is recommended to prevent air leaks and ensure optimal system response during braking operations.

OE cross-reference

303.02.0098 (4-circuit protection valve) is the equivalent of the Knorr-Bremse OE number. This part directly replaces Knorr-Bremse OE number AE4459.

Technical Specifications

Technical Specifications
Port 1M22x1,5
Port 21M16x1,5
Port 22M16x1,5
Port 23M16x1,5
Port 24M16x1,5
Opening Pressure 216,5 BAR
Opening Pressure 226,5 BAR
Opening Pressure 236,5 BAR
Opening Pressure 246,5 BAR
Closing Pressure 214,5 BAR
Closing Pressure 224,5 BAR
Closing Pressure 234,5 BAR
Closing Pressure 244,5 BAR

Other OEMs

KNORR-BREMSE

  • AE4459
  • AE 4459

Compatible Vehicles

Compatible Vehicles
BrandModelModel TypeEngine
KNORR-BREMSE

FAQ

What is the function of a 4-circuit protection valve?
It manages air pressure by splitting the supply into four independent circuits, preventing total brake system failure if one circuit loses pressure.
What are the port specifications for this valve?
The unit features one M22x1.5 port and four M16x1.5 ports to facilitate secure pneumatic connections.
What are the operating pressure ranges?
The valve operates with an opening pressure of 6.5 BAR and a closing pressure of 4.5 BAR for each circuit.
Is this valve compatible with Knorr-Bremse systems?
Yes, this component is designed to be compatible with Knorr-Bremse systems for heavy commercial vehicle braking applications.
What are the OE reference numbers of this part?
303.02.0098 directly replaces Knorr-Bremse OE number AE4459.