Blow Off/Dump Valves

Blow off Valve

Blow Off valves are used to prevent compressor surge. Compressor surge is a phenomenon that occurs when lifting off the throttle of a turbocharged car. When the throttle plate on a turbocharged engine running boost closes, high pressure in the intake system has nowhere to go and is forced to travel back to the turbocharger in the form of a pressure wave. This results in the wheel rapidly decreasing speed and stalling. Using a Blow Off valve the excess pressure from the turbocharger is vented into the atmosphere or recirculated into the intake upstream of the compressor inlet