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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