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303.02.0028 4-circuit protection valve, Brake System

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303.02.0028 Compatible 4-Circuit Protection Valve

303.02.0028

Summary

This 4-circuit protection valve is engineered for heavy commercial vehicle pneumatic systems, featuring M22x1.5 and M16x1.5 port configurations. Designed for reliability in air brake systems, it ensures proper pressure distribution across multiple circuits in Iveco applications. Equivalent to OE Iveco 98400429 and Knorr-Bremse AE4646.

Product identifiers
EAN Code8699031092874
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Compatible OEM Codes

  • KNORR-BREMSE
    • K019909N00
    • AE 4646
  • IVECO
    • 98400429

Description

What does a 4-circuit protection valve do?

This 4-circuit protection valve serves as a critical component within the pneumatic air brake system of heavy commercial vehicles. It functions by distributing supply pressure to four independent circuits—typically front, rear, spring, and trailer supply—while isolating any circuit that experiences a pressure loss to maintain overall braking integrity. Built with high-strength components, it ensures consistent performance under demanding operational conditions.

Compatible vehicles and engines

This component is specifically designed for use in Iveco vehicles and is compatible with Knorr-Bremse systems. It features a maximum operating pressure of 20 BAR and specific opening pressures ranging from 7.5 BAR to 8 BAR depending on the circuit, ensuring precise pneumatic control throughout the braking cycle.

Installation and maintenance

For professional installation, technicians should verify the port sizes, which include one M22x1.5 inlet and several M16x1.5 outlets. Regular inspection of the valve and connections is recommended to ensure optimal pressure distribution and to prevent system failure due to leaks or blockage.

Troubleshooting and selection

Consult your authorized distributor.

OE cross-reference

303.02.0028 (4-circuit protection valve) is the equivalent of the Iveco and Knorr-Bremse OE numbers. This part directly replaces Iveco OE number 98400429. It also replaces Knorr-Bremse OE numbers AE4646, K019909N00.

Technical Specifications

Technical Specifications
Port 1M22x1,5
Port 21M16x1,5
Port 22M16x1,5
Port 23M16x1,5
Port 24M16x1,5
Operating Pressure13 BAR
Opening Pressure 217,5 BAR
Opening Pressure 227,5 BAR
Opening Pressure 238 BAR
Opening Pressure 248 BAR
Closing Pressure 216,5 BAR
Closing Pressure 226,5 BAR
Closing Pressure 236,5 BAR
Closing Pressure 246,5 BAR
PressureMAX 20 BAR

Other OEMs

IVECO

  • 98400429

KNORR-BREMSE

  • AE4646
  • K019909N00
  • AE 4646

Related Products

Repair Kits

Compatible Vehicles

Compatible Vehicles
BrandModelModel TypeEngine
IVECO
KNORR-BREMSE

FAQ

What is the primary function of this protection valve?
It distributes supply pressure to four independent circuits and isolates any single circuit experiencing pressure loss to maintain braking safety.
Which vehicle brands is this component compatible with?
This part is compatible with Iveco vehicles and works within Knorr-Bremse pneumatic brake systems.
What are the technical port specifications?
The unit features one M22x1.5 port and multiple M16x1.5 ports, designed for high-pressure pneumatic applications.
What are the pressure limits for this valve?
The valve operates at a maximum pressure of 20 BAR, with specific circuit opening pressures between 7.5 BAR and 8 BAR.
What are the OE reference numbers of this part?
303.02.0028 directly replaces Iveco OE number 98400429. It also replaces Knorr-Bremse OE numbers AE4646, K019909N00.