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303.02.0102 4-circuit protection valve, Brake System

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303.02.0102 Compatible 4-Circuit Protection Valve

303.02.0102

Summary

This 4-circuit protection valve is designed for heavy commercial vehicle pneumatic brake systems, featuring M22x1.5 and M16x1.5 ports. It ensures critical circuit isolation for DAF and Alexander Dennis vehicles, maintaining system pressure across multiple independent lines. Equivalent to OE Alexander Dennis 657367, DAF 1505404 and WABCO 9347141260.

Product identifiers
EAN Code8683457009608
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Compatible OEM Codes

  • WABCO
    • 934 714 126 0
  • DAF
    • 1505404
  • ALEXANDER DENNIS
    • 657367

Description

What does a 4-circuit protection valve do?

This pneumatic component serves as a critical safety element within the air brake system of heavy commercial vehicles. By distributing supply pressure across four independent circuits, it ensures that a pressure loss in one area does not compromise the entire braking capability of the vehicle. The unit is constructed from high-strength components to withstand rigorous operating conditions.

Vehicle and system compatibility

This specific valve is compatible with DAF and Alexander Dennis vehicles. It functions effectively within WABCO pneumatic systems, providing reliable pressure management through its multi-port configuration. The design ensures that the front, rear, and auxiliary braking circuits remain isolated during pressure drops.

Technical specifications and installation

Technicians should note the specific port sizes: Port 1 utilizes an M22x1.5 thread, while Ports 21 through 24 feature M16x1.5 connections. When performing installation or maintenance, verify that the opening pressures (ranging from 8 to 8.5 BAR) and closing pressures (5 BAR) align with the existing system requirements to ensure optimal pneumatic performance.

Maintenance and troubleshooting

Regular inspection of the valve ports and seals is recommended during routine brake system service to prevent air leaks and maintain consistent braking response across all circuits.

OE cross-reference

303.02.0102 (4-circuit protection valve) is the equivalent of the Alexander Dennis, DAF and WABCO OE numbers. This part directly replaces Alexander Dennis OE number 657367. It also replaces DAF OE number 1505404 and WABCO OE number 9347141260.

Technical Specifications

Technical Specifications
Port 1M22x1,5
Port 21M16x1,5
Port 22M16x1,5
Port 23M16x1,5
Port 24M16x1,5
Opening Pressure 218 BAR
Opening Pressure 228 BAR
Closing Pressure 215 BAR
Closing Pressure 225 BAR
Closing Pressure 235 BAR
Closing Pressure 245 BAR
Opening Pressure 238,5 BAR
Opening Pressure 248 BAR

Other OEMs

ALEXANDER DENNIS

  • 657367

DAF

  • 1505404

WABCO

  • 9347141260
  • 934 714 126 0

Compatible Vehicles

Compatible Vehicles
BrandModelModel TypeEngine
ALEXANDER DENNIS
DAF
WABCO

FAQ

What is the primary function of this 4-circuit protection valve?
It distributes air pressure to four independent braking circuits and isolates them if a pressure loss occurs, maintaining braking safety.
Which vehicle brands is this part compatible with?
This component is designed for use in DAF and Alexander Dennis heavy commercial vehicles.
What are the port specifications for this component?
The device features one M22x1.5 port (Port 1) and four M16x1.5 ports (Ports 21, 22, 23, and 24).
What are the typical operating pressures?
The valve operates with opening pressures between 8 and 8.5 BAR and closing pressures of approximately 5 BAR.
What are the OE reference numbers of this part?
303.02.0102 directly replaces Alexander Dennis OE number 657367. It also replaces DAF OE number 1505404 and WABCO OE number 9347141260.