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Replacement for old "U.S.A.V. No. 64" Steam Radiator Air Vent?

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Jim_NY
Jim_NY Member Posts: 46
edited October 2021 in Strictly Steam
Anticipating a like-for-like functional replacement. (Single pipe steam, and it's the room with the thermostat.)
But couldn't find much online except for the obvious meaning of the initials, and less-than-stellar comments on current USAV quality.
Anything special to know - like fast/slow? (For some reason thinking higher numbers may mean faster.)
Also should note, still do have a couple of unused Hoffman 40s on hand.
Thanks.

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  • Jamie Hall
    Jamie Hall Member Posts: 23,282
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    Try one of the Hoffmans. I honestly have no idea what the capacity of that old vent is, but the 40 is as good a place to start as any.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • Jim_NY
    Jim_NY Member Posts: 46
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    Sounds good. Thanks.
  • mattmia2
    mattmia2 Member Posts: 9,637
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    Someone posted a table of different brands and vent rates a year or 2 ago. not sure if it has the more odball brands on it.
  • Jamie Hall
    Jamie Hall Member Posts: 23,282
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    That would be Gerry Gill's table, and it has a lot of obsolete vents on it... but not that one. I looked.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    mattmia2
  • BobC
    BobC Member Posts: 5,478
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    The newer USAV vents are poor quality. The hoffman 40 is a good choice if all the other radiator vents are similarand sized for the radiator they serve. It might be easier to buy the Maid-O-Mist 5L that comes with 5 orifices so you can dial in what you need.

    https://www.amazon.com/OMIST-0220-5L-Angle-Steam-Valve/dp/B003DV3AGE

    I've used them for years and never had a problem with the vents reliability.\

    Bob
    Smith G8-3 with EZ Gas @ 90,000 BTU, Single pipe steam
    Vaporstat with a 12oz cut-out and 4oz cut-in
    3PSI gauge
  • Jim_NY
    Jim_NY Member Posts: 46
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    Put in the Hoffman 40, and will see how it goes.
    Thanks for the info on alternatives.

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