Reed valve
A reed valve is one component that makes up the mechanical
external EGR used to prevent the backflow of intake air to the
exhaust side.
To prevent air on the air cleaner side from flowing to the EGR
cooler side, the reed valve is located at the junction where
combustion gases that have passed through the EGR valve
intersect with intake air.
Reed valves are only used in engines with a turbocharger.
Non-supercharged engines do not normally have a reed valve.
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