303.02.0076 4-circuit protection valve
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303.02.0076 KNORR-BREMSE 4-circuit protection valve

303.02.0076

Summary

●Port 1: M22x1,5 ●Port 21: M16x1,5 ●Port 22: M16x1,5 ●Port 23: M16x1,5 ●Port 24: M16x1,5 ●Opening Pressure 21: 7,9 BAR ●Opening Pressure 22: 7,9 BAR ●Opening Pressure 23: 7,9 BAR ●Opening Pressure 24: 7,9 BAR ●Closing Pressure 21: 6,4 BAR ●Closing Pressure 22: 6,4 BAR ●Closing Pressure 23: 6,4 BAR ●Closing Pressure 24: 6,4 BAR

EAN Code8683457009356
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Description

This specialized component serves as a critical regulator within the pneumatic brake system, ensuring stable air distribution across multiple circuits. Designed with heavy-duty grade materials, it maintains consistent pressure levels to protect the overall braking functionality of the vehicle during operation.

303.02.0076 is the OE equivalent of the KNORR-BREMSE AE 4177 4-circuit protection valve used in KNORR-BREMSE systems. This part ensures precise air routing and maintains pressure integrity within the heavy commercial vehicle braking architecture.

Workshop technicians should note the specific port configurations for seamless installation. The unit features one M22x1,5 port and four M16x1,5 ports. Monitoring the opening and closing pressure thresholds—specifically the 7,9 BAR opening and 6,4 BAR closing parameters—is essential for maintaining optimal system performance and safety standards during routine maintenance.

Technical Specifications

Port 1M22x1,5
Port 21M16x1,5
Port 22M16x1,5
Port 23M16x1,5
Port 24M16x1,5
Opening Pressure 217,9 BAR
Opening Pressure 227,9 BAR
Opening Pressure 237,9 BAR
Opening Pressure 247,9 BAR
Closing Pressure 216,4 BAR
Closing Pressure 226,4 BAR
Closing Pressure 236,4 BAR
Closing Pressure 246,4 BAR

Other OEMs

KNORR-BREMSE

  • AE 4177
  • AE4177

Related Products

Repair Kits

Vehicles Used

BrandModelEngine
KNORR-BREMSE

FAQ

What are the compatible OEM numbers for this part?
This product is a direct replacement for the KNORR-BREMSE AE 4177 system.
What are the technical port specifications?
The valve features Port 1 (M22x1,5) and four auxiliary ports (Port 21 to 24) with M16x1,5 threading.
At what pressure does the valve open and close?
The device is designed with an opening pressure of 7,9 BAR and a closing pressure of 6,4 BAR across its circuits.
Is this part suitable for heavy commercial vehicles?
Yes, it is engineered specifically for heavy commercial vehicle braking systems and pneumatic regulation.
Can this be used with KNORR-BREMSE systems?
Yes, it is fully compatible with KNORR-BREMSE systems requiring the AE 4177 specification.