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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.
Intake and exhaust valves. There are two types of engine valves: intake valves and exhaust valves. The valve which allows mixture into the cylinder is the air intake valve; the ones through which the spent gases escape are the exhaust valves.