303.02.0106 Compatible 4-Circuit Protection Valve

What does a 4-circuit protection valve do?

This 4-circuit protection valve plays a critical role in the pneumatic brake system by managing pressure distribution across multiple circuits. By isolating failed circuits, it prevents total pressure loss, ensuring that the remaining functional circuits continue to operate safely during heavy commercial vehicle operation.

Vehicle and system compatibility

The component is designed for compatibility with JAC and King Long vehicles. It functions effectively within WABCO systems to maintain the required pneumatic integrity across all four circuits. This part is essential for maintaining the safety standards of heavy commercial vehicles during transit.

Technical specifications and installation

Technical specifications include M22x1,5 Voss port configurations for all connections. The unit operates with specific pressure thresholds, such as an opening pressure of 6.9 BAR for several ports and a closing pressure range between 6.4 BAR and 7 BAR depending on the circuit. Always verify port sizing before installation.

Maintenance and troubleshooting

Regular inspection of the valve ensures that pneumatic distribution remains consistent. Technicians should check for any pressure leaks or irregular opening/closing behaviors that might indicate the need for replacement to ensure continuous brake system performance.

OE cross-reference

303.02.0106 (4-circuit protection valve) is the equivalent of the JAC, King Long and WABCO OE numbers. This part directly replaces JAC OE number 59480Y43G6. It also replaces King Long OE number 235500350 and WABCO OE number 9347144030.