If it's a single pipe system and the radiator is full of water there are only a few things it can be.
1 - the automatic air vent on the radiator is bad. They should be changed every few years. It may be letting the steam in but causing a vaccuum and not letting the water out.
3 - The radiator does not have enough pitch back. Use a level and be sure.
4 - the pipe going to the radiator is pitched wrong somewhere. (happens when people mess with things or the house settles)
5 - Your pressure-trol is set too high and you are making too much steam, too fast. for one pipe steam it should not be set over 1lb. a 1/2 lb is usually about right.
Those vents are probably broken. When they are put on the end like that they get damaged by the incoming steam. They need to be installed 12" from the end and on top of a 8" or 12" nipple so that they are out of harms way.
This is the next thing I'm going to do. Just have not had the money yet to do it. But I think it's guaranteed that the system will work better once I do.
Gabe
I think you just hijacked my thread. That's okay. This thread was pretty much dead anyway.
Do you know if you have an automatic feeder or does someone do it manually by hand?
The gauge glass should only be about half full. The valve that lets water in should not always be on or else that whole system will fill up with water.
When the boiler in the basement is half full with water it boils and that's what produces the steam.
That's the first thing I would check. If it's manually fed then close the fill valve and drain the boiler until the gauge glass is half full (there should be a mark for the water level). Don't do any work with the water hot. Shut it off and wait a while for the water to cool down.
When you close the fill that water should stop. If the water is still running then that means the valve is broken.
This is awkward, but...
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