303.02.0090 4-circuit protection valve
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303.02.0090 4-circuit protection valve — KNORR-BREMSE

303.02.0090

Summary

The 303.02.0090 is a high-strength 4-circuit protection valve designed for the brake system. It features Port 1 (M22x1,5) and four M16x1,5 ports (21, 22, 23, 24). Opening pressures are set at 6,3 BAR for ports 21 and 22, and 5,8 BAR for ports 23 and 24. This component is a direct replacement for the KNORR-BREMSE AE 4409.

EAN Code8683457009493
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Compatible OEM Codes

  • KNORR-BREMSE AE 4409

Description

The heavy duty 4-circuit protection valve ensures stable pneumatic pressure distribution across multiple circuits within the brake system. Designed with high-strength components, this part maintains precise pressure regulation to ensure vehicle safety and operational reliability during heavy commercial vehicle transport.

303.02.0090 is the OE-equivalent of the KNORR-BREMSE AE 4409 4-circuit protection valve used in specialized braking systems. It provides exact compatibility with the specified KNORR-BREMSE hardware requirements, ensuring seamless integration into the existing pneumatic architecture of the vehicle.

Technical specifications include Port 1 (M22x1,5) and Port 1 (M16x1,5) for Port 21 and Port 22, with specific opening pressures of 6,3 BAR. For Ports 23 and 24, the opening pressure is calibrated to 5,8 BAR, while all closing pressures are set at a consistent 3,8 BAR to maintain system integrity during operation.

Workshop technicians should verify the port thread sizes and pressure settings during installation to ensure optimal performance. This component is engineered for heavy commercial vehicle applications where precise pressure-switching is critical for pneumatic stability.

Technical Specifications

Port 1M22x1,5
Port 21M16x1,5
Port 22M16x1,5
Port 23M16x1,5
Port 24M16x1,5
Opening Pressure 216,3 BAR
Opening Pressure 226,3 BAR
Opening Pressure 235,8 BAR
Opening Pressure 245,8 BAR
Closing Pressure 213,8 BAR
Closing Pressure 223,8 BAR
Closing Pressure 233,8 BAR
Closing Pressure 243,8 BAR

Other OEMs

KNORR-BREMSE

  • AE4409
  • AE 4409

Vehicles Used

BrandModelEngine
KNORR-BREMSE

FAQ

What are the specific port dimensions for this valve?
The valve features Port 1 with M22x1,5 threads and Ports 21, 22, 23, and 24 with M16x1,5 threads.
Which OEM numbers is this part compatible with?
This product is a direct replacement for the KNORR-BREMSE AE 4409 reference.
What are the opening pressure settings for the circuits?
Ports 21 and 22 open at 6,3 BAR; Ports 23 and 24 open at 5,8 BAR.
What is the closing pressure for these ports?
The closing pressure for all ports (21, 22, 23, and 24) is set at 3,8 BAR.
Is this part suitable for heavy commercial vehicles?
Yes, it is designed specifically for heavy commercial vehicle braking systems requiring multi-circuit protection.