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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.
Most commonly located on the intake manifold, the EGR valve uses a signal from the vehicleâs computer or vacuum from the induction system to open a passage and allow the engineâs exhaust gasses to be reintroduced back into the engine, combined with incoming air / fuel mixture.ost commonly located on the intake manifold, the EGR valve uses a signal from the vehicleâs computer or vacuum from the induction system to open a passage and allow the engineâs exhaust gasses to be reintroduced back into the engine, combined with incoming air / fuel mixture.