Blowoff Valves

Some articles on valve, blowoff valve, blowoff:

Blowoff Valve - Definitions
... A compressor bypass valve (CBV), also known as a pressure relief valve or diverter valve, is a manifold vacuum-actuated valve designed to release pressure in the intake system of a turbocharged ... A blowoff valve, (not to be confused with a bypass valve) performs the same task but releases the air into the atmosphere instead of recirculating it ... The blowoff action produces a range of distinctive hissing sounds, depending on the exit design ...