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Blow Off Valves

Blow Off Valves (BOV) also known as Bypass Valves and Diverter Valves, are designed to prevent compressor surge by releasing excess pressure in turbo charged vehicles when the throttle is lifted. BOVs can be recirculatory, i.e. route the excess air back into the intake, or can dump the excess pressure to the atmosphere (the sometimes familar whoosh sound of turbo charged vehicles).