303.02.0085 4-circuit protection valve
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303.02.0085 4-circuit protection valve — KNORR-BREMSE

303.02.0085

Summary

The 303.02.0085 is a high-precision 4-circuit protection valve engineered for heavy commercial vehicle brake systems. It features specific port configurations including Port 1 (M22x1,5) and four M16x1,5 ports (21, 22, 23, 24) with calibrated opening and closing pressures to ensure optimal pneumatic circuit safety and reliability.

EAN Code8683457009448
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Description

The heavy-duty 4-circuit protection valve is a critical component designed to manage air pressure distribution within the pneumatic braking system of heavy commercial vehicles. This component ensures that even if one circuit experiences a failure, the remaining circuits maintain sufficient pressure to ensure safe vehicle operation and braking performance.

303.02.0085 is the OE-equivalent of the KNORR-BREMSE AE 4428 4-circuit protection valve used in VOLVO systems. This part is engineered to meet precise technical specifications, featuring a primary port of M22x1,5 and four auxiliary ports of M16x1,5. The pressure settings are calibrated for high reliability: Port 21, 22, and 24 operate at an opening pressure of 6,8 BAR and a closing pressure of 3,8 BAR, while Port 23 is set at an opening pressure of 7 BAR and a closing pressure of 5,5 BAR.

For workshop technicians performing brake system maintenance, this component offers direct compatibility with standard heavy-duty pneumatic lines. It is essential to verify the port thread sizes and pressure thresholds during installation to ensure seamless integration with existing KNORR-BREMSE or VOLVO braking architectures. Regular inspection of the valve's sealing surfaces and pressure response is recommended during routine fleet service intervals to maintain optimal safety standards.

Technical Specifications

Port 1M22x1,5
Port 21M16x1,5
Port 22M16x1,5
Port 23M16x1,5
Port 24M16x1,5
Opening Pressure 216,8 BAR
Opening Pressure 226,8 BAR
Opening Pressure 237 BAR
Opening Pressure 246,8 BAR
Closing Pressure 213,8 BAR
Closing Pressure 223,8 BAR
Closing Pressure 235,5 BAR
Closing Pressure 243,8 BAR

Other OEMs

KNORR-BREMSE

  • AE 4428
  • AE4428

VOLVO

  • 8152899

Related Products

Repair Kits

Vehicles Used

BrandModelEngine
KNORR-BREMSE
VOLVO

FAQ

Which vehicle makes are compatible with this part?
This product is designed for compatibility with KNORR-BREMSE systems and VOLVO heavy commercial vehicle braking architectures.
What are the OE equivalent numbers for this valve?
This part is an OE equivalent for KNORR-BREMSE AE 4428 and VOLVO 8152899.
What are the specific port thread sizes for installation?
The valve features one M22x1,5 port (Port 1) and four M16x1,5 ports (Ports 21, 22, 23, and 24).
What are the opening pressure specifications for the circuits?
The opening pressures are 6,8 BAR for ports 21, 22, and 24; port 23 has an opening pressure of 7 BAR.
What are the closing pressure thresholds for this component?
The closing pressure for ports 21, 22, and 24 is 3,8 BAR, while port 23 closes at a pressure of 5,5 BAR.