what is the fuction of EGR valve

Answer Posted / karthick

exhaust gas recirculation-high temperature inside the
combustion chamber emits NOx which combines with
hydrocarbons to form smog.to reduce this,some part of
exhaust gases is mixed with intake air.as the exhaust gases
have already been burned,so it doesn't burn again.this
reduces the temperature to hundred degree and thereby
reduces NOx emissions

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