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Air suction valve : ウィキペディア英語版
Air suction valve

An air suction valve (SAV) is a subsystem used to reduce emissions in the exhaust gases of internal combustion engines.
==Working principle==
When an engine exhaust valve is open, the pressure in the exhaust manifold is higher than atmospheric pressure. The exhaust manifold is configured in such a way that positive and negative pulses are produced during the operation of the cycle by designing it as a diffuser.
The SAV has three openings: one is connected to the manifold vacuum, another is connected to the exhaust pipe and the third is open to the atmosphere. When a negative pulse is induced in the exhaust, air from the atmosphere enters the exhaust manifold through a one-way reed valve and serves to oxidize the carbon monoxide and hydrocarbons in the exhaust.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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