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Whitworht Threads?

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scatgo
scatgo Member Posts: 94
edited September 17 in THE MAIN WALL
threads.jpg

I lost that part of a bleeder valve on a 100-year-old cast iron radiator. I was going to buy a screw at the hardware store and turn it down in my lathe but its not metric or SAE. I don't have a clue if any of the bleeder valves i see for sale with 1/8 or 1/4 NPT will fit and I am scared witless at the ide even trying to remove the old bleed valve because i don't want break anything and make my situation worse. Any body have a clue as to where I can get that part?

Comments

  • mattmia2
    mattmia2 Member Posts: 18,026

    probably proprietary to whoever made that valve.

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 20,960

    Just take the old bleeder out and replace the whole thing. They seldom break. If they do which is unlikely you just drill and tap it going a size larger if you have to. Most are 1/8" so drill and tap it for 1/4" Ips. But it is not likely to break.

    mattmia2
  • 109A_5
    109A_5 Member Posts: 4,382
    image.png

    You have a lathe. A properly outfitted Lathe can cut threads. Measure and match. Maybe dabble in the Machinist's Handbook a bit.

    " not metric or SAE " maybe the old USS (United States Standard) or UNC (Unified National Coarse).

    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System
    ChrisJ
  • Intplm.
    Intplm. Member Posts: 3,145

    Many times you do not need a drill if the bleeder threads break off inside. Often, you can set the tap inward and turn it with the broken piece still in the hole.

  • RascalOrnery
    RascalOrnery Member Posts: 158

    Bspt and bspp fittings are still used I the industry. You could probably find something nominal of mcmaster Carr or something and modify it.

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