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I am having problems with explosive steam exiting my radiators. At the end of last season I replaced all the valves on my radiators (10) with the varivalve - as recommended by my plumber. This is the first full season they are being used - as I waited to replace them when the heat was off.
The problems I am having are all in the back of my house (if that matters). The problem only occurs if the heat has gone off (meaning the water runs out) or - if we are raising it significantly. I usually keep it at a steady 66 or so. First I get a really loud noise - not a banging - and then huge amounts of steam come blasting out of the valve. I have tried 'closing' them - or moving the lever closer to closed rather than open. Last night the heat went off - as the water had run out. We woke up to a 53 degree house. We refilled the boiler and turned the heat up to 66. Two radiators at the back of the house went crazy. The one upstairs - just dripped water out of the valve opening until there was a small pool - the one on the first floor - directly below - spewed steam! I lowered the heat - threw a rag on the valve. This is the 3rd time this has happened. I was under the impression that these valves were the answer to all my banging and escaping steam problems. I no longer have the hammering the 'steam train' is significant. Can anyone help? Please!