Egr Valve (#PY-EGRA121)

EGR Valve PY-EGRA121
Brand: OYYZ

Exhaust Gas Recirculation (EGR) is one system that can send small part of the exhaust gas generated by the diesel engine back to the cylinder. The combustion process will be postponed due to the inertness of recirculating exhaust gas. That is to say the combustion speed will be slowed down, which will slow down the pressure forming process in the combustor. This is the main reason for the reduction of nitrogen oxides.

In addition, the increase of the exhaust gas recirculation rate will decrease the total volume of the exhaust gas, hence the total outputs of the pollutants emissions will be relatively reduced. EGR system's task is to make the amount of the exhaust gas recirculation achieve the best state in each operating point, so that the combustion process will always be under the ideal situation, which can guarantee the ultimate pollution composition of emissions will be the lowest.

When the amount of the exhaust gas recirculation changes, it will have different even the opposite effects on different pollution ingredients, so the so-called best state is usually a compromised solution which can make the total emissions of the relevant pollutants achieve the best. For example, although the increase of the exhaust gas recirculation rate will have a positive impact on reducing the emissions of the nitrogen oxides (NOx), it will have some bad effects on the increasing of particulate matter and other pollutants.