Hi Pat!
Weldcome to the forum!
the first question I have to ask you is; are these water cooled torches?
Because if they are, then your problem is alot easier to troubleshoot...
You say steam or water is coming out of the tip of the torch after running a few minutes and only after turning the torch off?
After reading this, I'd have to say there's a problem either in the torches water jackets, o-rings, improper assembly or if there's a solenoid attached to the feed line then, there maybe a problem there or in the circuitry that would turn off the solenoid when cutting and then open it after shutting down (installed in reverse)...
I know I'm taking a shot in the dark here but, when you consider the small amount of info you've provided, this is what you get for a response.
Good luck with your problem and if you could provide the forum with more details - who knows!!! We may just be able to help you solve this problem.
Respectfully,
SSBN727
Run Silent... Run Deep!!!
P.S. The only other thing I can think of is; for some reason or another, there is condensation coming into your O2 line because you're using a manifold attached to liquid O2 tanks... Then again, that's just a guess.