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303.02.0088 4-circuit protection valve, Brake System

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303.02.0088 Compatible 4-Circuit Protection Valve

303.02.0088

Summary

This 4-circuit protection valve is designed for heavy commercial vehicle brake systems. It features M22x1.5 and M16x1.5 port configurations with specific opening pressures of 7 BAR and closing pressures of 4.5 BAR to ensure pneumatic circuit integrity. Equivalent to OE Knorr-Bremse AE4406.

Product identifiers
EAN Code8683457009479
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Compatible OEM Codes

  • KNORR-BREMSE
    • AE 4406

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 separate circuits. By isolating different sections of the braking system, it ensures that a leak in one circuit does not lead to a total loss of braking pressure across the entire vehicle. This component is engineered using high-strength components to withstand constant pressure fluctuations.

System compatibility and technical design

This valve is compatible with Knorr-Bremse systems and provides reliable pressure regulation. It is specifically designed for heavy commercial vehicle applications where system redundancy is vital for safety. The unit features a primary M22x1.5 port and four secondary M16x1.5 ports to manage air distribution effectively.

Installation and maintenance guidance

For proper installation, technicians should verify that all port connections are seated correctly to prevent air leaks. The specified opening pressure is 7 BAR, while the closing pressure is maintained at 4.5 BAR for each circuit. Regular inspection of the seals and connection points is recommended during routine maintenance intervals to ensure optimal pneumatic performance.

System performance and reliability

Consult your authorized distributor for more information.

OE cross-reference

303.02.0088 (4-circuit protection valve) is the equivalent of the Knorr-Bremse OE number. This part directly replaces Knorr-Bremse OE number AE4406.

Technical Specifications

Technical Specifications
Port 1M22x1,5
Port 21M16x1,5
Port 22M16x1,5
Port 23M16x1,5
Port 24M16x1,5
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

Other OEMs

KNORR-BREMSE

  • AE4406
  • AE 4406

Compatible Vehicles

Compatible Vehicles
BrandModelModel TypeEngine
KNORR-BREMSE

FAQ

What is the function of a 4-circuit protection valve?
It divides the air supply into four independent circuits, ensuring that if one circuit fails due to a leak, the remaining circuits still maintain enough pressure for braking.
What are the port specifications for this component?
The valve features one M22x1.5 port and four M16x1.5 ports designed for secure pneumatic connections.
What are the pressure thresholds for this valve?
The unit operates with an opening pressure of 7 BAR and a closing pressure of 4.5 BAR across its circuits.
Which systems is this valve compatible with?
This component is designed to be compatible with Knorr-Bremse systems used in heavy commercial vehicle braking applications.
What are the OE reference numbers of this part?
303.02.0088 directly replaces Knorr-Bremse OE number AE4406.