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exhaust valve - a valve through which burned gases from a cylinder escape into the exhaust manifold. exhaust system, exhaust - system consisting of the parts of an engine through which burned gases or steam are discharged. valve - control consisting of a mechanical device for controlling the flow of a fluid.
The exhaust gas recirculation valve is a component commonly found on many road going vehicles. It is a part of the vehicleâs exhaust gas recirculation (EGR) system, an emissions system that is designed to recirculate exhaust gases back into the vehicleâs intake in order to reduce cylinder temperatures and NOx emissions. The EGR valve is one of the main components that controls the flow and recirculation of these exhaust gases.