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Posted by jtown on December 29, 2003 at 20:02:17:
In Reply to: purpose of nut at the bottom side of one-pipe steam radiator? posted by ken on December 29, 2003 at 19:42:57:
The real big "nut" is a pipe plug for use as two pipe steam or water, little nuts may be on threaded rod to clamp the radiator sections together. A little pipe plug two thirds of the way down is where your vent should be. Bleeders are mounted at the top for water usage. Open your valve all the way CCW and turn slightly in to not jam. Put an air vent (not a valve) on that works. And then go look elsewhere, like bad pitch of radiator or piping. The disc may have fallen off the shutoff valve, someone may have picked up the far side of the radiator, filling the valve end with sediment. Let system cool so all vents open back up. Turn up stat. Take vent off and keep in your hand until others get good and hot or steam comes out the hole. Don't go away and leave it open unless you want to remove wallpaper. If the others get hot and that one doesn't get steam, then it is not the vent. If valve starts to get hot but nothing else, there is probably blockage in the piping, valve or radiator.