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I dont know of any parts that make a flame, but a quick look in a gas dryer should give some insight into how such a device might work. On mine, when it comes on, I see a piece of nichrome (like your stove element) get red hot. Then a click (which I suspect is the gas valve) and the gas passes near the glowing wire. The fire starts up and then the glowing wire extinguishes itself. There is also a sensor which determines when the fire goes out (thus leaking gas into the house), but I have never seen that happen on mine.