303.02.0043 4-circuit protection valve
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303.02.0043 4-circuit protection valve — KNORR-BREMSE

303.02.0043

Summary

●Port 1: M22x1,5 ●Port 21: M16x1,5 ●Port 22: M16x1,5 ●Port 23: M16x1,5 ●Port 24: M16x1,5 ●Operating Pressure: 12 BAR ●Opening Pressure 21: 8 BAR ●Opening Pressure 22: 8 BAR ●Opening Pressure 23: 8,3 BAR ●Opening Pressure 24: 8 BAR ●Closing Pressure 21: 5,5 BAR ●Closing Pressure 22: 5,5 BAR ●Closing Pressure 23: 5,5 BAR ●Closing Pressure 24: 5,5 BAR ●Max Pressure: 20 BAR

EAN Code8683457005228
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Description

The heavy-duty grade materials used in this protection valve ensure reliable pneumatic regulation within the braking system. This component acts as a critical safety element, managing pressure distribution across four distinct circuits to maintain system integrity during heavy commercial vehicle operations.

This product is the OE-equivalent of the KNORR-BREMSE AE 4615, II39140F, and II39140FM1 used in KNORR-BREMSE systems. It is engineered to meet the strict technical requirements of high-pressure pneumatic circuits in the heavy commercial vehicle sector.

For workshop technicians, this part offers precise installation with standardized thread sizes (M22x1,5 and M16x1,5). It is essential to verify the opening and closing pressure settings—such as the 8 BAR opening pressure for ports 21, 22, and 24—to ensure optimal performance and safety during service intervals.

Maintaining the correct operating pressure of up to 12 BAR and ensuring no pressure exceeds the maximum threshold of 20 BAR is vital for the longevity of the braking components.

Technical Specifications

Port 1M22x1,5
Port 21M16x1,5
Port 22M16x1,5
Port 23M16x1,5
Port 24M16x1,5
Operating Pressure12 BAR
Opening Pressure 218 BAR
Opening Pressure 228 BAR
Opening Pressure 238,3 BAR
Opening Pressure 248 BAR
Closing Pressure 215,5 BAR
Closing Pressure 225,5 BAR
Closing Pressure 235,5 BAR
Closing Pressure 245,5 BAR
PressureMAX 20 BAR

Other OEMs

KNORR-BREMSE

  • AE 4615
  • II39140F
  • II39140FM1
  • AE4615

Related Products

Repair Kits

Vehicles Used

BrandModelEngine
KNORR-BREMSE

FAQ

What are the compatible OEM codes for this part?
This part is compatible with KNORR-BREMSE codes AE 4615, II39140F, and II39140FM1.
What are the thread specifications for the ports?
The device features Port 1 with M22x1,5 and Ports 21, 22, 23, and 24 with M16x1,5 threads.
What is the maximum operating pressure?
The component is designed for an operating pressure of up to 12 BAR with a maximum pressure limit of 20 BAR.
Which vehicle systems does this part fit?
It is designed specifically for KNORR-BREMSE pneumatic braking systems in heavy commercial vehicles.
What are the opening pressure settings for this valve?
The opening pressures are set at 8 BAR for ports 21, 22, and 24, and at 8.3 BAR for port 23.