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How to tell size of Maid o Mist radiator vent?

bipbap
bipbap Member Posts: 191
in Strictly Steam
Our building has Maid o Mist steam vents on many of the radiators. They are the ones that say "Jacobus Self-Adjustable Air Valve".

I'm trying to balance things on our 1-pipe steam system and my understanding is that these vents would originally have come with a set of different bits to change the vent size opening to adjust for how fast or slow the radiator air was pushed out.
I'm trying to see if there is any way to figure out what size bit/opening is currently on them since they don't seem to have any markings on them? And also, if I can determine what size and then need to change the size, is there any way to buy the new bit or is it necessary to just buy the whole vent with a new set of opening bits?
Thanks! This site is amazing, I learn something new every day here.

Comments

  • Chris_L
    Chris_L Member Posts: 336
    On mine, the vent letter or number is stamped on the orifice that screws into the vent. You can see the sizes here:
    http://www.maid-o-mist.com/jacobus.html

    If you can't read the size on the orifice, you can use a drill bit to measure the size of the hole.

    I don't know if you can buy the orifices separately, but when I had one that was too big, I just filled the hole with solder, and then drilled it out to the size I wanted. And if you have one that is too small, you could do the same.
    BobC

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