303.02.0033 Compatible 4-Circuit Protection Valve
303.02.0033
Summary
This 4-circuit protection valve is designed for heavy commercial vehicle pneumatic brake systems. It features M22x1.5 and M16x1.5 port sizes, ensuring reliable air distribution and circuit isolation for MAN, Scania, DAF, and other heavy vehicles. High-strength components ensure durability under high pressure. Equivalent to OE Alexander Dennis AB9347142110, DAF 1505406 and MAN ZG046460002.
| EAN Code | 8699031096308 |
|---|
Ready to Order
Compatible OEM Codes
-
SCANIA
- 1935516
- 1431049
- 1356635
- 1337904
-
WABCO
- 934 714 211 0
- 934 714 128 0
-
VDL
- 28210202900
-
VAN HOOL
- 10740689
-
ProVia
- PRO 122 003 0
-
MAN
- ZG.04646-0002
-
DAF
- 1505406
-
ALEXANDER DENNIS
- AB9347142110
Description
What does a 4-circuit protection valve do?
This 4-circuit protection valve plays a critical role in the pneumatic brake system of heavy commercial vehicles by distributing pressurized air to independent circuits. By managing air flow through specific ports—including an M22x1.5 inlet and multiple M16x1.5 outlets—the component ensures that a pressure loss in one circuit does not compromise the entire braking system. This isolation capability is essential for maintaining safety during heavy-duty operation.Vehicle compatibility and application
This component is designed for use in Alexander Dennis, DAF, MAN, Scania, Van Hool, and VDL vehicles. It is fully compatible with WABCO systems and other professional pneumatic brake assemblies used in the heavy commercial sector. The design ensures precise pressure regulation across all four circuits to maintain stable braking performance.Installation and technical maintenance
Technicians should verify that the opening pressures of 6.5 BAR and 7.4 BAR align with the vehicle's specific requirements during installation. When replacing this valve, ensure all M16x1.5 connections are secure to prevent leaks. Proper maintenance of the pneumatic lines connected to this valve is vital for ensuring the correct operation of the spring brake and service circuits.System reliability and selection
Regular inspection of the valve ports and pressure settings can help prevent unexpected system failures in buses and trucks. Consult your authorized distributor.OE cross-reference
303.02.0033 (4-circuit protection valve) is the equivalent of the Alexander Dennis, DAF, MAN, Provia, Scania, Van Hool, VDL and WABCO OE numbers. This part directly replaces Alexander Dennis OE number AB9347142110. It also replaces DAF OE number 1505406, MAN OE number ZG046460002, Provia OE number PRO1220030, Scania OE numbers 1337904, 1356635, 1431049, 1935516, Van Hool OE number 10740689, VDL OE number 28210202900 and WABCO OE numbers 9347141280, 9347142110.Technical Specifications
| Port 1 | M22x1,5 |
|---|---|
| Port 21 | M16x1,5 |
| Port 22 | M16x1,5 |
| Port 23 | M16x1,5 |
| Port 24 | M16x1,5 |
| Opening Pressure 21 | 6,5 BAR |
| Opening Pressure 22 | 6,5 BAR |
| Opening Pressure 23 | 6,5 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 |
| Opening Pressure 24 | 6,5 BAR |
| Opening Pressure 23 | 7,4 BAR |
Other OEMs
ALEXANDER DENNIS
- AB9347142110
DAF
- 1505406
MAN
- ZG046460002
- ZG.04646-0002
ProVia
- PRO 122 003 0
SCANIA
- 1935516
- 1431049
- 1356635
- 1337904
VAN HOOL
- 10740689
VDL
- 28210202900
WABCO
- 9347142110
- 9347141280
- 934.714.211.0
- 934 714 211 0
- 934 714 128 0
Related Products
Repair Kits
Compatible Vehicles
| Brand | Model | Model Type | Engine |
|---|---|---|---|
| ALEXANDER DENNIS | |||
| DAF | |||
| MAN | |||
| ProVia | |||
| SCANIA | |||
| VAN HOOL | |||
| VDL | |||
| WABCO |
FAQ
What is the primary function of this 4-circuit protection valve?
It distributes pressurized air from the compressor to four separate circuits and isolates any circuit experiencing a pressure loss to maintain braking safety.
Which vehicle brands is this component compatible with?
This part is designed for heavy commercial vehicles including Alexander Dennis, DAF, MAN, Scania, Van Hool, and VDL.
What are the technical port specifications?
The unit features an M22x1.5 port for the inlet and M16x1.5 ports for the circuit outlets to ensure precise pneumatic connection.
How can I identify if a replacement is needed?
If there is a continuous pressure drop in specific brake circuits despite system checks, it may indicate a failure in the protection valve's internal isolation mechanism.
What are the OE reference numbers of this part?
303.02.0033 directly replaces Alexander Dennis OE number AB9347142110. It also replaces DAF OE number 1505406, MAN OE number ZG046460002, Provia OE number PRO1220030, Scania OE numbers 1337904, 1356635, 1431049, 1935516, Van Hool OE number 10740689, VDL OE number 28210202900 and WABCO OE numbers 9347141280, 9347142110.