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Help! Water spewing out of radiator air valves

dvinarc Member Posts: 1
edited October 2020 in THE MAIN WALL
A little back story, I moved into my Grandfather's house that has been vacant for about a year or two 3 months ago and have been dealing with various issues around the house such as putting in new water lines to kitchen, replacing fallen plaster ceiling, etc.

Now that the temperature has been dropping at night I turned on the heat which is a boiler run one pipe steam radiator system. I went into my bedroom maybe a few minutes after running the system and found water spewing out of the radiator air valve. So no problem I thought, I cleaned up the mess, ran to HD bought a new air vent valve (#6 for my upstairs bedroom) and replaced it. Ok, turn on the heat again walk around the house and now the down stairs family room radiator is spewing out water. Turn off the heat, look at the air vent valve which looks newer and fine but isn't screwed in securely, so I wrap a little plumbers tape around the threading and screw it back in. I turn the heat back on walk around the house again and see the upstairs bathroom radiator is now spewing water out of the air valve! Each time it is about a gallon of water that is coming out. I'm not sure what is causing this. I had my boiler serviced a month or so ago and I know that water is always coming out of only 1 radiator out of 10 in the house at a time, and it is always from the air valve. Please provide any assistance if possible I have already racked up thousands of dollars of bills in the process of fixing previous problems around the house and while being laid off due too Covid I would really not like to call a plumber unless absolutely necessary. Thank you!