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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.
If exhaust silencers withbuilt-in speed controls areused, the speed of the cylinder motion may be individually controlled ineach direction.Also, five-ported valves can function as dual pressurevalves whereair flows from the exhaust portsto the cylinder and both cylinder ports use the inlet as acommon exhaust.