A blow-off valve (BOV), also called a bypass valve, diverter valve or dump valve is a pressure release system present in most turbocharged engines. Its purpose is to prevent compressor surge and reduce wear on the turbocharger and engine. Blow-off valves relieve the damaging effects of compressor "surge loading" by allowing the compressed air to vent to the atmosphere, making a distinct hissing sound, or recirculated into the intake upstream of the compressor inlet.
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