303.02.0103 Compatible 4-Circuit Protection Valve
303.02.0103
Summary
This 4-circuit protection valve is engineered for heavy commercial vehicle pneumatic brake systems. It features specific port configurations including 1/2" - 14 PTF and 3/8" - 18 NPTF/PTF connections, ensuring reliable pressure distribution and circuit isolation. Equivalent to OE DAF 1518193, ERF 4000795 and WABCO 9347141370.
| EAN Code | 8683457009745 |
|---|
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Compatible OEM Codes
-
WABCO
- 934 714 137 0
-
ERF
- 4000795
-
DAF
- 1518193
Description
What does a protection valve do?
This protection valve plays a critical role in the pneumatic brake system of heavy commercial vehicles by managing air pressure distribution. It functions by splitting the air supply into four independent circuits, which typically serve the front brakes, rear brakes, spring brakes, and trailer supply. By isolating any circuit experiencing a sudden pressure drop, it maintains braking integrity for the remaining parts of the system.Vehicle and system compatibility
This component is specifically designed to be compatible with DAF and ERF trucks. It integrates seamlessly into the air processing assembly, working alongside WABCO systems to ensure consistent pneumatic performance under heavy-duty operating conditions.Technical specifications and installation
Technical specifications include an opening pressure of 6.2 BAR and a closing pressure of 4.2 BAR across ports 21, 22, 23, and 24. The unit utilizes high-strength components to withstand fluctuating pressures. When performing maintenance, technicians should verify that all port connections—ranging from 1/2" - 14 PTF to 3/8" - 18 NPTF—are securely seated to prevent leaks.Maintenance and troubleshooting
Regular inspection of the valve's performance is recommended to prevent system-wide pressure loss. If a vehicle experiences uneven braking or air supply instability, checking this valve's internal diaphragms and pressure thresholds is a primary diagnostic step.OE cross-reference
303.02.0103 (4-circuit protection valve) is the equivalent of the DAF, ERF and WABCO OE numbers. This part directly replaces DAF OE number 1518193. It also replaces ERF OE number 4000795 and WABCO OE number 9347141370.Technical Specifications
| Port 1 | 1/2" - 14 PTF |
|---|---|
| Port 21 | 3/8" - 18 NPTF |
| Port 22 | 3/8" - 18 PTF |
| Port 23 | 3/8" - 18 PTF |
| Port 24 | 3/8" - 18 PTF |
| Opening Pressure 21 | 6,2 BAR |
| Opening Pressure 22 | 6,2 BAR |
| Opening Pressure 23 | 6,2 BAR |
| Opening Pressure 24 | 6,2 BAR |
| Closing Pressure 21 | 4,2 BAR |
| Closing Pressure 22 | 4,2 BAR |
| Closing Pressure 23 | 4,2 BAR |
| Closing Pressure 24 | 4,2 BAR |
Other OEMs
DAF
- 1518193
ERF
- 4000795
WABCO
- 9347141370
- 934 714 137 0
Compatible Vehicles
| Brand | Model | Model Type | Engine |
|---|---|---|---|
| DAF | |||
| ERF | |||
| WABCO |
FAQ
What is the primary function of this 4-circuit protection valve?
It distributes air supply pressure to four independent brake circuits and isolates any circuit that experiences a significant pressure loss to maintain safety.
Which vehicle brands is this component compatible with?
This part is designed for use in DAF and ERF heavy commercial vehicles and is compatible with WABCO systems.
What are the pressure thresholds for this valve?
The component operates with an opening pressure of 6.2 BAR and a closing pressure of 4.2 BAR for its various ports.
How can I identify if the protection valve needs replacement?
Technicians should look for symptoms of uneven braking or air pressure instability within the pneumatic system which may indicate a faulty valve.
What are the OE reference numbers of this part?
303.02.0103 directly replaces DAF OE number 1518193. It also replaces ERF OE number 4000795 and WABCO OE number 9347141370.