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    10 MINUTE TECH BLOW OFF VALVES

    Jul 16, 2021 4 minutes

    1 WHAT ARE BLOW-OFF VALVES AND WHAT DO THEY DO?

    A blow-off valve or dump valve – more commonly known as a diverter valve or recirculating valve in recent years – is a valve built into the compressed boost side of the turbocharger or pipe work to allow the expulsion of excess boost pressure from the turbo system when coming off the throttle. Most blow-off valves (BOVs) work via a vacuum line, which allows the piston to open when the throttle is closed and release the pressurised air – however many modern cars now come with electronically actuated BOVs. This elevates pressure on the turbo itself and stops any excessive surge whilst allowing the turbine blades to continue spinning,

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