303.02.0111 4-Circuit Protection Valve — WABCO Compatible
303.02.0111
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 pressure distribution for DAF and Scania vehicles. This component is essential for maintaining pneumatic system integrity across multiple circuits. Equivalent to OE DAF 1505399, Scania 1337904 and WABCO 9347023870.
| EAN Code | 8683457009820 |
|---|
Ready to Order
Compatible OEM Codes
-
SCANIA
- 1935508
- 1381883
- 1356635
- 1337904
-
WABCO
- 934 702 387 0
-
DAF
- 1505399
Description
This 4-circuit protection valve serves as a critical component within the pneumatic brake system of heavy commercial vehicles. It functions by receiving pressurized air from the compressor and distributing it across four independent circuits, including front and rear brakes, spring brakes, and trailer supply lines. By isolating any circuit that experiences a pressure loss, it prevents a single leak from compromising the entire braking system.
This specific unit is compatible with DAF and Scania vehicles and is engineered to work seamlessly within WABCO systems. The component features precise technical specifications, including an M22x1.5 inlet port and multiple M16x1.5 outlet ports. Opening pressures are calibrated at 6.5 BAR for most circuits, with a dedicated 7.5 BAR opening pressure for Port 23, ensuring optimal pressure regulation throughout the braking assembly.
For workshop technicians, ensuring correct installation is vital for pneumatic system safety. When replacing this valve, verify that all port connections are secure and that the opening/closing pressures align with the vehicle requirements. Maintaining clean air supply to the valve prevents premature wear of internal diaphragms and check valves.
Consult your authorized distributor to ensure this component meets your specific vehicle application requirements.
This specific unit is compatible with DAF and Scania vehicles and is engineered to work seamlessly within WABCO systems. The component features precise technical specifications, including an M22x1.5 inlet port and multiple M16x1.5 outlet ports. Opening pressures are calibrated at 6.5 BAR for most circuits, with a dedicated 7.5 BAR opening pressure for Port 23, ensuring optimal pressure regulation throughout the braking assembly.
For workshop technicians, ensuring correct installation is vital for pneumatic system safety. When replacing this valve, verify that all port connections are secure and that the opening/closing pressures align with the vehicle requirements. Maintaining clean air supply to the valve prevents premature wear of internal diaphragms and check valves.
Consult your authorized distributor to ensure this component meets your specific vehicle application requirements.
OE cross-reference
303.02.0111 (4-circuit protection valve) is the equivalent of the DAF, Scania and WABCO OE numbers. This part directly replaces DAF OE number 1505399. It also replaces Scania OE numbers 1337904, 1356635, 1381883, 1935508 and WABCO OE number 9347023870.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 | 7,5 BAR |
| Opening Pressure 24 | 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 |
Other OEMs
DAF
- 1505399
SCANIA
- 1935508
- 1381883
- 1356635
- 1337904
WABCO
- 9347023870
- 934 702 387 0
Compatible Vehicles
| Brand | Model | Model Type | Engine |
|---|---|---|---|
| DAF | |||
| SCANIA | |||
| WABCO |
FAQ
What is the primary function of this 4-circuit protection valve?
It distributes pressurized air to four separate brake circuits and isolates any circuit experiencing pressure loss to maintain overall braking capability.
Which vehicle brands is this component compatible with?
This part is designed for use in DAF and Scania heavy commercial vehicles and is compatible with WABCO systems.
What are the specific port sizes for this valve?
The unit features one M22x1.5 port (Port 1) and four M16x1.5 ports (Ports 21, 22, 23, and 24).
What are the typical opening pressures for the circuits?
The opening pressure is 6.5 BAR for ports 21, 22, and 24, while port 23 operates at an opening pressure of 7.5 BAR.
What are the OE reference numbers of this part?
303.02.0111 directly replaces DAF OE number 1505399. It also replaces Scania OE numbers 1337904, 1356635, 1381883, 1935508 and WABCO OE number 9347023870.