Pressure Protection Valve

The 170.9055411 / Pressure Protection Valve (Automann) is a critical safety component in an air brake system. Its role is to maintain a minimum “holdback” pressure by preventing air loss from primary circuits into less critical downstream circuits during a failure or pressure drop. In essence, when system pressure falls below the valve’s threshold, it closes off secondary lines, ensuring the main braking circuits retain sufficient air for safe operation. Commonly used in heavy duty trucks, this valve helps protect against total brake failure by preserving pressure for core systems. Automann designs it to match cross reference standards and robust performance expectations, while Wofford Truck Parts supplies it with backing for fitment support. For trucks operating under diverse load and ambient conditions, a reliable pressure protection valve is essential to maintaining braking safety and system resilience.