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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.
Purge valve: it is a part of the car's emission control system. It monitors the fuel vapors that get recycled into the engine for combustion. Some call it evap canister, or evap valve, etc. Great information.