Stuck at level 8 ending

[Raipe]

Once i got the acid elevator workin (using 2 chemicals) there is long wall with stuck elevator, i tried the steam pressure whells and nothing happened. please help

[ROT51]

Be sure you don't keep open more than 2 valves. For example: keep valves 1 and 3 open, and close number 2. That should work.

[Penumbra]

Yeah, that while took me a while to figure out.