303.02.0045 4-circuit protection valve — KNORR-BREMSE

The 4-circuit protection valve is a critical component within the pneumatic braking system of heavy commercial vehicles, designed to manage and isolate air pressure across multiple circuits. This part ensures that even if one circuit experiences a failure, the remaining circuits maintain sufficient pressure to ensure vehicle safety and braking functionality.

303.02.0045 is the OE-equivalent of the KNORR-BREMSE AE 4619 and II39775F 4-circuit protection valves used in heavy commercial vehicle braking systems. This component maintains precise operational control with an operating pressure of up to 12 BAR and a maximum pressure of 20 BAR, ensuring consistent performance under rigorous industrial conditions.

Designed for professional workshop technicians, this unit features specific port dimensions including a primary M22x1,5 port and four M16x1,5 ports (Ports 21, 22, 23, and 24). The opening pressures are calibrated at 7,2 BAR (Port 21), 7,4 BAR (Port 22), 6,3 BAR (Port 23), and 7 BAR (Port 24), with corresponding closing pressures to ensure rapid system response during maintenance or pressure drops.

Regular inspection of the valve settings and port integrity is recommended during routine brake system servicing to maintain optimal safety standards in heavy-duty applications.