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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.
It has an exhaust manifold, which channels all of the exhaust gases produced by the engine's individual cylinders into one pipe. The gases are then made to pass through a catalytic converter, a device that helps transform the exhaust gases into less harmful substances.