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Does anyone have any information on when he should appear or how? As he is not seem to be at the location stated on the map.

When this guy is in town offering Wutritzels Konstruktionswahn,
the Wutritzel Bauwerkzeugsatz reward contains a Überdruckventil.
Once you have three, either from doing it three times over the course of time, or from partnering with other people:
Use all three Ächzende Abgasröhre/Ächzende Abgasröhre/Ächzende Abgasröhres.
Use all three Überdruckventil/Überdruckventil/Überdruckventils in the middle of said pipes.
Use the Großer roter Knopf that appears in the middle.
Doppelgängers then emerge from Das Doppeltor.
Kill Die Doppelgang for credit towards Einen Kolben kürzer
BTW it's a hidden quest, you don't have to accept it or turn it in. It's like an (invisible) wold quest in that regard - you do the stuff, and you get the (meagre) reward.
BTW BTW, even though the Valves persist in your inventory after quest days, the pipes are only accessible on on such days (when Cogfrenzy is in town).

Walton Wutritzel <Hauptarchitekt von Mechagon>