The purpose of a purge valve is to remove any air from the lines of a nitrous kit and ensure the purity of the nitrous flowing through the lines, so without an actual nitrous kit... no.
I suppose you could rig something up that would simulate a purge valve, but if you're not actually using nitrous in your car, it would just make you look like an idiot who let the fast and furious movies get too deep into your head. Honestly, nitrous isn't really a wise power boost if you ask me. Turbochargers, superchargers, blowers, there are so many better options.
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"Ok, systems check; the battery is discharging, the oil temperature is very high, the oil pressure is very low, the engine temperature is off the end of the scale, I'm running out of petrol... but the clock is correct!"
-James May, in an old, worn out Lamborghini purchased for less than £10,000.
