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Can manual valves be adjusted for 2-pipe vapor systems?
My following question pertains to the manual shutoff valves, not thermostatic valves.
So for quite a while now, I have read "on the internet" that steam shutoff valves were "on or off" only. More recently, I read that "on or off" was only for the case for 1-pipe steam. With 2-pipe steam systems, manual valves can be adjusted. By adjusted, I mean to allow for high/medium/low volumes of steam and corresponding heat for the radiators.
Can someone please clarify if my understanding is correct?