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Air Valves on 2 Pipe System ?
I have a unique situation, a very old 2 pipe system that in addition to the steam traps
on the radiators, someone installed air valves ( Hoffman #40's) midway up
each radiator on same end as traps. Isn't this minimizing the operation of the traps ?
To make matters more frustrating, I haven't been able to find a F&T trap anywhere
in the system ( the basement is completely finished ), and finally, it is venting live
steam out of the end of main air vent. There is a bit of water hammer at this vent
location at start up but seems to quiet down after it runs awhile.