So my assumption that there was a bug was wrong. These valves are just drawn a bit weirdly, with the flame having to fly through the open air a bit.
OK, I am now through with the Dungeon Master Sage
Ahhh. you are right. Now I remember about these: There's some bug rendering these valves invisible for some reason in may playthrough. https://ibb.co/Y07KP1Y
When I click the empty mid between those pipe ends it actually does click, but I don't know the curretn state of the valves. Also I don't ...
I only toggled the big power switches (one next to each launcher-pair and one in the mid before the door). I have checked the few pipes at the walls multiple times and didn't notice any interactive element there?
Where are there valves?
Well, as I have no other information, and the walkthrough for the original DM2 doesn't mention this, I have to assume that I have run into a bug
You don't happen do still have an old savegame from this point in the game after so many years?
I have seen that the rocks just burn for a limited time, and I can se ethe furnace still running in the control room, also the lightning generator that is driven by the generator is working. So my problem is not about the 'main quest' - it's about a secondary thing, namely the fiereballs ...
I recently started playing Dungeon Master II through Return To Chaos 0.49.
In this forum I read of people who said they had played it completely in RTC. I haven't played DM II ever before (just DM 1 and CSB), but I still got through the game rather far, without needing any help.