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Hydronic radiator valves: Holes inside myth?
I am still relatively new to the industry and just started a full time job in it. One question I can't seem to get to the bottom of is holes in hydronic radiator valves. There are a few persons in the business that have told me that you can't truly close a hydronic radiator valve because there is a small hole in the valve to allow some water to pass through to prevent freezing. My teacher at school, who works in the business, says it is a myth. Personally I think it is a myth too, but there are old folks that been doing heating for years that swear it is true.