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As I understand it, "purge" means to remove unwanted contents...
Explanation: such as sediment from a boiler, air trapped in a hydraulic system (e.g. automobile brakes), etc., without removal of a significant amount of the desired substance (i.e. water, hydraulic fluid).
"Flushing" means to remove all of the contents of a container or system by passing a second substance through it.
Explanation: The purge valve is an auxiliary nitrous solenoid that is activated manually by the driver prior to a nitrous assisted pass. This solenoid vents the gaseous nitrous from the supply line that connects the nitrous bottle to the nitrous solenoid. This allows a pure liquid nitrous charge to enter the engine for an instant surge of power. A purge valve is worth about a tenth of a second on a quarter mile pass.