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303.02.0035 4-circuit protection valve, Brake System

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303.02.0035 Compatible 4-Circuit Protection Valve

303.02.0035

Summary

This high-strength 4-circuit protection valve features M22x1.5 and M16x1.5 ports, providing critical pressure distribution for Scania, DAF, and VDL vehicles. Designed for heavy-duty pneumatic brake systems to ensure circuit isolation and stability. Equivalent to OE Alexander Dennis AB9347023810, DAF 0271944A and Leyland 661690.

Product identifiers
EAN Code8699031096322
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Compatible OEM Codes

  • DAF
    • 271944
    • 0384037R
    • 0384037A
    • 0384037
    • 0271944R
    • 0271944A
  • NEOPLAN
    • 112230000
    • 11018615
  • WABCO
    • 934 702 381 0
  • VDL
    • 40271944
  • SCANIA
    • 307605
  • LEYLAND
    • 661690
  • ALEXANDER DENNIS
    • AB9347023810

Description

What does a 4-circuit protection valve do?

This 4-circuit protection valve plays a vital role in the pneumatic brake system of heavy commercial vehicles by distributing compressed air from the compressor to four independent circuits. By utilizing high-strength components, it ensures that a pressure loss in one circuit does not compromise the performance of the remaining lines, maintaining essential braking capability for the vehicle.

Vehicle and system compatibility

This component is engineered for compatibility with Scania, DAF, VDL, Alexander Dennis, Leyland, and Neoplan vehicles. It is also compatible with WABCO systems. The unit provides reliable pressure management across all primary pneumatic lines used in heavy commercial service.

Technical specifications and maintenance

The valve features specific port configurations including one M22x1.5 inlet and four M16x1.5 outlets. Maintenance technicians should verify the opening pressure of 6.5 BAR and closing pressure of 4.5 BAR during routine inspections to ensure optimal pneumatic system integrity.

Installation guidance

Proper installation ensures the continuous distribution of air to front, rear, spring, and auxiliary circuits. Consult your authorized distributor for fitment verification.

OE cross-reference

303.02.0035 (4-circuit protection valve) is the equivalent of the Alexander Dennis, DAF, Leyland, Neoplan, Scania, VDL and WABCO OE numbers. This part directly replaces Alexander Dennis OE number AB9347023810. It also replaces DAF OE numbers 0271944A, 0271944R, 0384037, 0384037A, 0384037R, 271944, Leyland OE number 661690, Neoplan OE numbers 11018615, 112230000, Scania OE number 307605, VDL OE number 40271944 and WABCO OE number 9347023810.

Technical Specifications

Technical Specifications
Port 1M22x1,5
Port 21M16x1,5
Port 22M16x1,5
Port 23M16x1,5
Port 24M16x1,5
Opening Pressure 216,5 BAR
Opening Pressure 226,5 BAR
Opening Pressure 236,5 BAR
Opening Pressure 246,5 BAR
Closing Pressure 214,5 BAR
Closing Pressure 224,5 BAR
Closing Pressure 234,5 BAR
Closing Pressure 244,5 BAR

Other OEMs

ALEXANDER DENNIS

  • AB9347023810

DAF

  • 271944
  • 0384037R
  • 0384037A
  • 0384037
  • 0271944R
  • 0271944A

LEYLAND

  • 661690

NEOPLAN

  • 112230000
  • 11018615

SCANIA

  • 307605

VDL

  • 40271944

WABCO

  • 9347023810
  • 934.702.381.0
  • 934 702 381 0

Compatible Vehicles

Compatible Vehicles
BrandModelModel TypeEngine
ALEXANDER DENNIS
DAF
LEYLAND
NEOPLAN
SCANIA
VDL
WABCO

FAQ

What is the primary function of this protection valve?
It distributes pressurized air to four separate circuits and isolates any circuit experiencing a pressure loss to protect the rest of the braking system.
Which vehicle brands are compatible with this part?
This component is suitable for Scania, DAF, VDL, Alexander Dennis, Leyland, and Neoplan heavy commercial vehicles.
What are the port specifications for this component?
The unit is equipped with one M22x1.5 port and four M16x1.5 ports for secure pneumatic connections.
What are the standard operating pressures?
The valve operates with an opening pressure of 6.5 BAR and a closing pressure of 4.5 BAR across its circuits.
What are the OE reference numbers of this part?
303.02.0035 directly replaces Alexander Dennis OE number AB9347023810. It also replaces DAF OE numbers 0271944A, 0271944R, 0384037, 0384037A, 0384037R, 271944, Leyland OE number 661690, Neoplan OE numbers 11018615, 112230000, Scania OE number 307605, VDL OE number 40271944 and WABCO OE number 9347023810.