Replacing steam boiler main vents

mdwilmoth

I have an old single pipe steam system in a two story colonial in New Hampshire. I have been trouble shooting some noisy pipes and have been able to replace most of the radiator valves. But I also found 3 old Hoffman No. 2 (1/8") valves on the mail lines in the basement. They are in really bad shape but of course you can no longer buy Hoffman No. 2 valves. They look like regular angled radiator valves but I assumed the main line requires a different valve than my radiators. Can anyone suggest what type valve I should replace these with?

gerry gill

Can you fit a Gorton #2 where those old vents are?

Steamhead

Those #2 valves were vacuum vents made for radiators.

How long are your steam mains, and what pipe size? This will tell us how much air you need to vent.