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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.
1 This stroke produces mechanical work from the engine to turn the crankshaft. 2  Exhaust: During the exhaust stroke, the piston once again returns to T.D.C from B.D.C while the exhaust valve is open.