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What's the best TRV for one-pipe steam heat?
I'm looking to install some TRVs on radiators in a one pipe steam heating system. We manage a 4 story apartment building in Boston where the back of the building is facing south and gets a lot of direct sunlight. The rear apartments are almost always warmer than the front, north-facing apartments (aside from some cloudy/stormy days). Some of the rear apartments have TRVs in them, but others have vent-rite vents that replaced some of the TRVs as they stopped working.
The TRVs we have are pretty old and made by a company called "Flair Mfg Corp" and a few are made by "Honeywell Braukmann". Attached are a few pictures of the TRVs. I'm not sure if any of these current TRVs have vacuum breakers; do they?
After reading Dan's book "The Lost Art of Steam Heating", I see he mentions Danfoss RA-2000 (which has a vacuum breaker) as a good TRV for single pipe steam heat. When I go to look this product up online I see manuals for it, but no where do I find that exact vent (RA-2000 - I see other Danfoss products though). Do they still sell the RA-2000 or is there maybe a better version made by Danfoss out now?
I'm just wondering what people recommend for a good TRV with a vacuum breaker to prevent over-heating. Should I replace my old TRVs or just buy new vents for them (any advice on where to buy online or near Boston MA)? Any suggestions would be much appreciated. Thank you.