303.02.0081 4-circuit protection valve
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303.02.0081 KNORR-BREMSE 4-circuit protection valve

303.02.0081

Summary

●Port 1: M22x1,5 ●Port 21: M16x1,5 ●Port 22: M16x1,5 ●Port 23: M16x1,5 ●Port 24: M16x1,5 ●Opening Pressure 21: 7 BAR ●Opening Pressure 22: 7 BAR ●Opening Pressure 23: 7 BAR ●Opening Pressure 24: 7 BAR ●Closing Pressure 21: 4,5 BAR ●Closing Pressure 22: 4,5 BAR ●Closing Pressure 23: 4,5 BAR ●Closing Pressure 24: 4,5 BAR

EAN Code8683457009400
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Description

The heavy duty 4-circuit protection valve is a critical component in the pneumatic braking system of heavy commercial vehicles. It ensures the reliable distribution and isolation of air pressure across multiple circuits, maintaining system integrity during operation. This component is engineered using high-strength components to withstand constant pressure fluctuations and ensure long-term functional stability in demanding environments.

303.02.0081 is the OE equivalent of the KNORR-BREMSE AE 4187 4-circuit protection valve used in heavy commercial vehicle braking systems. This part is designed to meet strict technical specifications, ensuring seamless integration with existing pneumatic architectures. The specific port dimensions and pressure thresholds are optimized for precision and reliability within the brake system.

Workshop technicians should note the specific port configurations for installation: Port 1 features an M22x1,5 thread, while Ports 21, 22, 23, and 24 utilize M16x1,5 threads. All four circuits are calibrated with an opening pressure of 7 BAR and a closing pressure of 4,5 BAR to ensure predictable performance during system depressurization or failure scenarios.

Technical Specifications

Port 1M22x1,5
Port 21M16x1,5
Port 22M16x1,5
Port 23M16x1,5
Port 24M16x1,5
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

Other OEMs

KNORR-BREMSE

  • AE 4187
  • AE4187

Related Products

Repair Kits

Vehicles Used

BrandModelEngine
KNORR-BREMSE

FAQ

What are the technical port sizes for this valve?
The valve features one Port 1 with M22x1,5 and four auxiliary ports (21, 22, 23, 24) with M16x1,5 threads.
Which OEM code is this part equivalent to?
This product is a direct replacement for the KNORR-BREMSE AE 4187 model.
What are the opening and closing pressure settings?
The opening pressure for all four circuits is set at 7 BAR, while the closing pressure is set at 4,5 BAR.
Is this part suitable for heavy commercial vehicles?
Yes, this is a high-strength component designed specifically for the pneumatic brake systems of heavy commercial vehicles.
Can I use this with KNORR-BREMSE systems?
Yes, this part is fully compatible with KNORR-BREMSE systems requiring the AE 4187 specification.