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    Blow-Off (Bypass) Valves

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    Rick Ears

    Posts : 145
    Join date : 2009-02-25

    Blow-Off (Bypass) Valves

    Post  Rick Ears on Sun Mar 01, 2009 4:00 pm

    The Blow-Off valve (BOV) is a pressure relief device on the intake
    tract to prevent the turbo’s compressor from going into surge. The BOV
    should be installed between the compressor discharge and the throttle
    body, preferably downstream of the charge air cooler (if equipped).
    When the throttle is closed rapidly, the airflow is quickly reduced,
    causing flow instability and pressure fluctuations. These rapidly
    cycling pressure fluctuations are the audible evidence of surge. Surge
    can eventually lead to thrust bearing failure due to the high loads
    associated with it. Blow-Off valves use a combination of
    manifold pressure signal and spring force to detect when the throttle
    is closed. When the throttle is closed rapidly, the BOV vents boost in
    the intake tract to atmosphere to relieve the pressure; helping to
    eliminate the phenomenon of surge.

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