303.02.0051 4-circuit protection valve
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303.02.0051 KNORR-BREMSE 4-circuit protection valve

303.02.0051

Summary

●Port 1: M22x1,5 ●Port 21: M16x1,5 ●Port 22: M16x1,5 ●Port 23: M16x1,5 ●Port 24: M16x1,5 ●Operating Pressure: 13 BAR ●Opening Pressure 21-24: 7 BAR ●Closing Pressure 21-24: 4,5 BAR ●Max Pressure: 20 BAR. This heavy-duty component ensures stable pneumatic circuit regulation.

EAN Code8683457005303
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Description

The pneumatic regulation of heavy commercial vehicle braking systems requires high-strength components capable of maintaining consistent pressure thresholds. This 4-circuit protection valve is engineered to manage air distribution across multiple circuits, ensuring that even during pressure fluctuations, the system maintains optimal safety and stability for the vehicle.

303.02.0051 is the OE-equivalent of the KNORR-BREMSE AE 4645 and K019908 4-circuit protection valves used in KNORR-BREMSE systems. This component is designed for high-performance applications where precise opening and closing pressures are critical for operational safety.

Workshop technicians should ensure that all port connections—specifically the M22x1,5 main port and the four M16x1,5 auxiliary ports—are secured properly to prevent air leaks. The unit operates with a standard opening pressure of 7 BAR and a closing pressure of 4,5 BAR across its circuits, making it a vital part for routine maintenance and system overhauls in heavy commercial vehicle fleets.

Technical Specifications

Port 1M22x1,5
Port 21M16x1,5
Port 22M16x1,5
Port 23M16x1,5
Port 24M16x1,5
Operating Pressure13 BAR
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
PressureMAX 20 BAR

Other OEMs

KNORR-BREMSE

  • AE 4645
  • K019908
  • AE4645

Related Products

Repair Kits

Vehicles Used

BrandModelEngine
KNORR-BREMSE

FAQ

What are the specific port sizes for this valve?
The valve features one M22x1,5 port (Port 1) and four M16x1,5 ports (Ports 21, 22, 23, and 24) for secure pneumatic connections.
Which OEM numbers is this product compatible with?
This product is a direct replacement for KNORR-BREMSE AE 4645 and K019908.
What is the operating pressure range of the unit?
The device operates at a standard pressure of 13 BAR, with a maximum pressure capacity of up to 20 BAR.
At what pressure do the circuits open and close?
The opening pressure for ports 21 through 24 is set at 7 BAR, while the closing pressure is set at 4,5 BAR.
Is this part suitable for heavy commercial vehicles?
Yes, it is specifically designed for heavy commercial vehicle brake systems requiring reliable multi-circuit protection.