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303.02.0082 4-circuit protection valve, Brake System
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303.02.0082 Compatible 4-Circuit Protection Valve

303.02.0082

Summary

This heavy-duty 4-circuit protection valve ensures pneumatic stability within the brake system. Features include M22x1,5 and M16x1,5 port sizes, with opening pressures ranging from 6.5 BAR to 7 BAR. Designed for high-strength performance in commercial vehicle braking circuits. Equivalent to OE Knorr-Bremse AE4188.

Product identifiers
EAN Code8683457009417
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Compatible OEM Codes

  • KNORR-BREMSE
    • AE 4188

Description

What does a protection valve do?

This protection valve plays a critical role in maintaining pneumatic pressure distribution across multiple independent braking circuits. By isolating pressure drops in one circuit from the others, it ensures that a single leak does not lead to a complete loss of braking capability, providing essential safety for heavy commercial vehicles.

System compatibility and technical specs

This component is designed for seamless integration into pneumatic brake systems and is compatible with Knorr-Bremse systems. It features specific pressure thresholds, including a 7 BAR opening pressure for ports 21 and 22, and 6.5 BAR for ports 23 and 24, ensuring precise modulation throughout the system.

Installation and maintenance

For correct installation, technicians should verify that all port connections—including the M22x1,5 and M16x1,5 threads—are seated correctly to prevent air leaks. Regular inspection of the valve's response to opening and closing pressures (typically 4.5 BAR) is recommended during scheduled maintenance intervals to ensure optimal system integrity.

Troubleshooting guidance

Consult your authorized distributor for further technical assistance regarding system integration.

OE cross-reference

303.02.0082 (4-circuit protection valve) is the equivalent of the Knorr-Bremse OE number. This part directly replaces Knorr-Bremse OE number AE4188.

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 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

  • AE4188
  • AE 4188

Related Products

Repair Kits

Compatible Vehicles

Compatible Vehicles
BrandModelModel TypeEngine
KNORR-BREMSE

FAQ

What is the primary function of this protection valve?
It protects the pneumatic brake system by isolating individual circuits, preventing air pressure loss in one circuit from affecting the entire system.
Which port sizes are used on this component?
The valve utilizes an M22x1,5 port for the main connection and M16x1,5 ports for the circuit outputs.
What are the typical pressure settings for this valve?
The device features opening pressures of 7 BAR or 6.5 BAR depending on the port, with a standard closing pressure of approximately 4.5 BAR.
Is this component compatible with Knorr-Bremse systems?
Yes, this component is designed to be compatible with Knorr-Bremse systems and similar heavy commercial vehicle braking architectures.
What are the OE reference numbers of this part?
303.02.0082 directly replaces Knorr-Bremse OE number AE4188.