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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.
Gate valves. Linear motion valves used to start and stop flow. The valve is completely opened when the disk is removed from the flow stream. Classification of gate valves is made by the type of disk used: solid wedge, flexible wedge, split wedge, or parallel disk.