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Another question on radiator valves.
I have these old Maid o' Mists that I am replacing with Gorton's.
I know if they fail close, you can't blow through them. And, you can boil them in vinegar.
But, how do you know if they fail open? Some of them seem to constantly hiss. I can't see any steam coming out of them. (I guess if you have dry steam, you shouldn't be seeing steam.) So, how do I know if it's air or actual steam?