Blowoff valve

A blowoff valve (also called dump valve or compressor bypass valve) is a pressure release system present in most petrol turbocharged engines. Blowoff valves are used to reduce pressure in the intake system as the throttle is closed, thus preventing compressor surge.

Throttle open, therefore the blowoff valve is shut

Throttle closed, air pushes the blowoff valve open (upwards)

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