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Gorton #C steam vent valve replacement + hammering/clanging noise
I live on the top 7th floor of an old Manhattan apartment building with one-pipe steam radiators. I recently replaced the broken air vent (Hoffman No. 43 straight 1/4" NPT) with an Gorton #C 1/4" straight vent. The radiator went from leaking hot steam to quietly venting. The apartment went from warm and VERY humid to warm and nicely dry. Mission accomplished, I thought.
Three weeks later, I'm noticing loud clanging and banging noises (water or steam hammering?).
What can I do to fix this? Did I do something wrong with my DIY vent replacement?
A few thoughts:
-Is my new Gorton #C vent too small for a 7th floor apartment? Switch to Gorton #D? To blame for the noise?
-I installed the Gorton #C vent vertically upright with the threads toward the floor. Correct?
-Yes, the main supply valve knob is fully opened. But maybe it's faulty? Does it need tightening or graphite packing or something?
-The radiator seems to be properly sloped-down towards the main supply one-pipe.
Any ideas would be very helpful! Thanks!