303.02.0069 4-circuit protection valve
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303.02.0069 4-circuit protection valve — KNORR-BREMSE

303.02.0069

Summary

The 303.02.0069 is a heavy-duty 4-circuit protection valve designed for critical brake system functions. It features specific port dimensions: Port 1 (M22x1,5), Port 11, 12, 21, 22, 23, and 24 (M16x1,5). This component ensures precise pressure regulation with an opening pressure of up to 7,6 BAR for circuits 21 and 22, and 6,7 BAR for circuits 23 and 24.

EAN Code8683457009288
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Description

The heavy-duty 4-circuit protection valve is a critical component within the pneumatic brake system of heavy commercial vehicles. It serves to manage air distribution across multiple circuits, ensuring that pressure levels are maintained and that the system remains responsive under varying operational loads. This part is engineered using high-strength components to withstand the rigorous demands of the heavy vehicle industry.

303.02.0069 is the OE-equivalent of the KNORR-BREMSE AE 4421 4-circuit protection valve used in braking systems. This product is fully compatible with KNORR-BREMSE hardware and meets strict industrial standards for reliability and precision in pneumatic control.

For workshop technicians, this valve offers a precise fit with specific port configurations: Port 1 is M22x1,5, while ports 11, 12, 21, 22, 23, and 24 are M16x1,5. The device operates with a maximum pressure of 20 BAR. Technicians should verify the opening pressures (7,6 BAR for ports 21/22 and 6,7 BAR for ports 23/24) to ensure optimal system performance during routine maintenance or replacement in heavy commercial vehicle fleets.

Technical Specifications

Port 1M22x1,5
Port 12M16x1,5
Port 21M16x1,5
Port 22M16x1,5
Port 11M16x1,5
Port 23M16x1,5
Port 24M16x1,5
PressureMAX 20 BAR
Opening Pressure 217,6 BAR
Opening Pressure 227,6 BAR
Opening Pressure 236,7 BAR
Opening Pressure 246,7 BAR
Closing Pressure 214,3 BAR
Closing Pressure 224,3 BAR
Closing Pressure 235,5 BAR
Closing Pressure 245,5 BAR

Other OEMs

KNORR-BREMSE

  • AE 4421
  • AE4421

Related Products

Repair Kits

Vehicles Used

BrandModelEngine
KNORR-BREMSE

FAQ

What is the compatibility of the 303.02.0069 valve?
This part is an OE-equivalent for the KNORR-BREMSE AE 4421 system, ensuring seamless integration into compatible pneumatic brake systems.
What are the thread sizes for the ports on this unit?
The unit features a Port 1 size of M22x1,5 and Ports 11, 12, 21, 22, 23, and 24 with a size of M16x1,5.
Can this part be used in light commercial vehicles?
No, this component is designed specifically for heavy commercial vehicles and heavy-duty braking systems.
What is the maximum operating pressure for this valve?
The maximum operating pressure for this technical component is rated at up to 20 BAR.
Does it include all necessary OEM codes?
Yes, this product is designed to match the specifications of the KNORR-BREMSE AE 4421 reference.