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Steam radiator valve heights

TerranTerran Member Posts: 8
Hi all, happy new year! I've gotten some very useful advice here and I wanted to give something back. I recently learned that not all steam radiator valves are the same height, and it's not just an old-vs-today difference, they're made today in different sizes.

In these pictures, front and back for 1 1/4" and for 1", a Bluefin valve I got from supplyhouse is on the left, and a Marsh valve from nyrpgroup is on the right. The Marsh valves have a spec sheet which gives the dimensions from the bottom to the centerline of the union, but the others don't; you can see they're about a ¼" shorter. I think the pictures got put in a random order when I uploaded them, unfortunately.

Hope this helps someone get a replacement valve that matches and avoid having to rework the pipe!
Mark N


  • Mark NMark N Member Posts: 1,087
    Three years ago I had all my radiators refinished and replaced all the valves with Marsh. I had no issues at all. All the rads matched up perfectly with the Marsh valves. Much higher quality than the imported ones.
  • JUGHNEJUGHNE Member Posts: 6,965
    The fact that the better valve is taller and has what looks to be a larger internal passageway for counterflow steam, means that there is more meat/brass in it.
    Just by weight alone you get more for your money.
  • FredFred Member Posts: 8,423
    I notice the Marsh valve doesn't have a packing nut around the valve stem though. I assume you have to take the entire bonnet off and repack from the inside?
  • JUGHNEJUGHNE Member Posts: 6,965
    But how often does that get done? Every 40 years maybe?
  • FredFred Member Posts: 8,423
    JUGHNE said:

    But how often does that get done? Every 40 years maybe?

    Yea, about the time you have to virtually twist and grind on that bonnet to break it loose. When I replace something like that, I smile and think to myself; "I'll be dead before it becomes an issue for someone". :D
  • Mark NMark N Member Posts: 1,087
    Marsh valves are packless.
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