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Hoffman 40 blows and blows

steam-rookie
steam-rookie Member Posts: 128
in Strictly Steam
I have just replaced a loud,hissing,gurgling, Hoffman 40, with a brand new one.

The new vent just blows air. no gurgling. Just air

The air is not that hot, I can put my hand over it

The radiator heats up but the vent never closes, it just keeps on blowing

On one of my previous posts, it was suggested that I have very inadequate main venting.

I have still not corrected this issue and have only one main vent, as compared to the 2 or 3 that I should have

Is it possible that this Hoffman 40 is acting like a main vent?

Shouldn't the vent close at some point. It never has closed yet?
73 year old one pipe system with original American standard boiler, oil fired becket, 2 inch steel pipe main, 100 feet long, with 8 radiators above.
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