303.02.0046 4-circuit protection valve

The 4-circuit protection valve is a critical component within the pneumatic braking system of heavy commercial vehicles. It serves to isolate different air circuits, ensuring that a failure or leak in one part of the system does not compromise the entire braking performance. This component is designed with high-strength components to maintain consistent pressure regulation and circuit integrity during heavy-duty operations.

303.02.0046 is the OE equivalent of the 4-circuit protection valve used in the brake system. This technical component features a primary port (Port 1) of M22x1,5 and four secondary ports (Port 21, 22, 23, and 24) measuring M16x1,5 each. The device is engineered to handle an operating pressure of 12 BAR, with specific opening thresholds at 8 BAR for ports 21 and 22, and 8.3 BAR for port 23, ensuring precise pneumatic response.

For workshop technicians performing routine maintenance or system repairs, this valve offers reliable performance with specific closing pressures set at 5.5 BAR across all auxiliary ports. Maintenance should focus on ensuring all M16x1,5 connections are secure and that no debris enters the pneumatic lines to prevent blockage. Regular inspection of the port seals is recommended to maintain optimal air pressure stability within the vehicle's braking architecture.