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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.
An exhaust system is usually piping used to guide reaction exhaust gases away from a controlled combustion inside an engine or stove. 1  The entire system conveys burnt gases from the engine and includes one or more exhaust pipes. Depending on the overall system design, the exhaust gas may flow through one or more of: 1  Cylinder head and exhaust manifold. 2  A turbocharger to increase engine power. 3  A catalytic converter to reduce air pollution. 4  A muffler (North America) / silencer (UK/India), to reduce noise.