Blow off valve(BOV), bypass 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 the atmosphere, making a distinct
hissing sound, or recirculate into the intake upstream of the compressor
inlet.
A blow off valve is connected by a vacuum hose to the intake manifold after throttle plate. When the throttle is closed, the relative manifold pressure drops below atmospheric pressure an the resulting pressure differential operates the blow off valve's piston. The excess pressure from the turbocharger is then vented into the atmosphere or recirculated into the intake upstream of the compressor inlet.
A blow off valve is connected by a vacuum hose to the intake manifold after throttle plate. When the throttle is closed, the relative manifold pressure drops below atmospheric pressure an the resulting pressure differential operates the blow off valve's piston. The excess pressure from the turbocharger is then vented into the atmosphere or recirculated into the intake upstream of the compressor inlet.
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