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 .
13-660: (Redirected from BOV ) [REDACTED] Look up bov or BOV in Wiktionary, the free dictionary. Bov or BOV may refer to: Places [ edit ] Bove,tBulgaria , a village in Svoge municipality, Sofia Province Bov Municipality , Denmark Bov Parish , in the Diocese of Haderslev, Aabenraa Municipality, Denmark Bov Point , Antarctica Transport and technology [ edit ] BOV (armoured personnel carrier) ,
26-468: A Yugoslav wheeled armored personnel carrier Blowoff valve , an element of most turbocharged engines Bug-out vehicle , used by survivalists for emergency evacuation Bailout valve, in scuba diving with a rebreather Other uses [ edit ] Bov (mythology) , or Bodb Derg, a king in Irish mythology Bank of Valletta , Malta MVDOL (ISO 4217 code BOV), a Bolivian account currency tied to
39-399: A gear change), the flow reduces beyond the surge line of the compressor. At this point the change in pressure across the compressor reduces, leading to a collapse in flow and possibly even flow reversal and a collapse in plenum pressure. As the compressor is still spinning at high speed, once the flow has reduced sufficiently, the change in pressure across the compressor begins to rise and flow
52-648: A king in Irish mythology Bank of Valletta , Malta MVDOL (ISO 4217 code BOV), a Bolivian account currency tied to the US dollar Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with the title Bov . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Bov&oldid=1246698971 " Categories : Disambiguation pages Place name disambiguation pages Hidden categories: Short description
65-412: A reference pressure for the blowoff valve. When the throttle is open, the air pressure on both sides of the blowoff valve's piston is equal, therefore the spring holds the valve closed. As the throttle closes, the pressure in the intake manifold drops below the pressure upstream of the throttle, which causes the valve to open. This allows the excess pressure from the turbocharger to be released into either
78-419: Is designed to release pressure in the intake system when the throttle is closed. A "recirculating" type blowoff valve releases the pressurised air back into the non-pressurized section of the intake (i.e. upstream of the turbocharger), while an "atmospheric venting" type blowoff valve dumps the air directly into the atmosphere. A vacuum hose connected to the intake manifold downstream of the throttle provides
91-424: Is different from Wikidata All article disambiguation pages All disambiguation pages bov [REDACTED] Look up bov or BOV in Wiktionary, the free dictionary. Bov or BOV may refer to: Places [ edit ] Bove,tBulgaria , a village in Svoge municipality, Sofia Province Bov Municipality , Denmark Bov Parish , in
104-401: Is different from Wikidata All article disambiguation pages All disambiguation pages Blowoff valve A key function of blowoff valves is to prevent compressor surge , a phenomenon that would otherwise occur as the throttle is closed in a turbocharged engine. If the turbocharger's compressor wheel is spinning at high speed when the throttle is suddenly closed (such as during
117-417: Is re-established into the plenum. This rapid cycle of pressurisation and depressurisation repeats until the compressor has slowed sufficiently or the throttle is re-opened. The sound produced by compressor surge is called turbo flutter and the repeated, high speed cycling will cause a cyclic torque on the compressor and may lead to increased stresses on the bearings and compressor impeller. A blowoff valve
130-469: The Diocese of Haderslev, Aabenraa Municipality, Denmark Bov Point , Antarctica Transport and technology [ edit ] BOV (armoured personnel carrier) , a Yugoslav wheeled armored personnel carrier Blowoff valve , an element of most turbocharged engines Bug-out vehicle , used by survivalists for emergency evacuation Bailout valve, in scuba diving with a rebreather Other uses [ edit ] Bov (mythology) , or Bodb Derg,
143-480: The US dollar Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with the title Bov . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Bov&oldid=1246698971 " Categories : Disambiguation pages Place name disambiguation pages Hidden categories: Short description
SECTION 10
#1732844316680156-481: The atmosphere or the intake manifold. In the case where an airflow sensor is present upstream from the blowoff valve and the blowoff valve vents to atmosphere, the fuel injection system is unaware that some of the intake air has been vented instead of going into the cylinders. This volume of vented air is no longer relevant to the engine, however it is still included in the calculations for the required amount of fuel, which causes excess fuel to be injected and therefore
169-440: The engine briefly operates with a fuel-rich mixture after each blowoff valve actuation. Effects of this rich running can include fouling the spark plugs , damaging the catalytic converter , stalling and hesitation when the throttle is opened. One method to avoid this issue is by locating the airflow sensor downstream of the blowoff valve (known as a blow-through setup, as opposed to the traditional draw-through setup). By using
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