![]() Compared with an electrical actuated EGR valve, the main advantage of the pneumatic valve is the low cost, lack of mechanical transmission and simplicity. Early versions of pneumatic EGR valve does not use electrical energy to move the actual valve, but a shaft connected to a diaphragm in vacuum cylinder. The vast majority of valves in production, up until Euro 3 emissions standards, had an inward opening poppet valve operated by a vacuum actuator. The main function of an EGR valve is to allow the exhaust gases to flow from the exhaust manifold into the intake manifold. variable geometry actuation mechanism (turbine).Image: High and low pressure exhaust gas recirculation (EGR) layout Some vehicles have both high and low pressure EGR systems, which means that the EGR components are doubled. Most of the EGR system contains at least an: combustion temperature: which is reduced because the higher heat capacity of carbon dioxide (CO 2) and water vapour (H 2O) draws in part of the combustion heat.oxygen: which is displaced by inert (exhaust) gases.By doing this, the main ingredients of NO x emissions are reduced: EGR takes exhaust gases from the exhaust manifold and reintroduces them into the intake manifold, mixing them with fresh air. ![]()
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