What is an EGR Valve?

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EGR Valve:

Within modern, diesel combustion engines, Exhaust Gas Recirculation (EGR) is a method to manage Nitrogen Oxides (NOx) emissions, produced as a byproduct during the combustion process. Air from the environment is usually a mix of Oxygen and Nitrogen. When the air combines with fuel and ignites inside the combustion chamber, temperatures increase and produce NOx emissions.

The EGR system works by returning a little portion of an engine’s exhaust gas to the engine’s combustion chambers through the manifold, lowering combustion temperatures and so reducing the number of NOx emitted.

The EGR valve is the main component of the EGR system and it’s normally closed. It connects the manifold to the manifold and is controlled by either a vacuum or a built-in electric step motor. The function of the EGR valve is to regulate the flow of exhaust gas being recirculated reckoning on the engine load.


Nitrogen Oxide (NOx):

Nitrogen oxides are emissions produced as a byproduct from the method of combustion, Nitrogen, and Oxygen gases within the air react during combustion, especially at high temperatures.

NOx is a major component of smog and might have detrimental effects on human health furthermore as ecosystems and crops. Therefore, incorporating EGR systems into the planning of a car is very important with regards to lowering harmful emissions to save lots of the environment and have a positive impact on human health.


EGR Valve and an MOT Test:

In the past, car owners attempted to get rid of EGR valves and Diesel Particulate Filters (DPFs) from their vehicles to avoid costly repairs. However, for Euro 6 Emissions Standards compliant vehicles it’s now been stated by the Department for Transportation that removing the EGR valve or PDF is unlawful because the vehicle will not be compliant with the road vehicle regulations.

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