Click here to Find a Contractor in your area.
Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit

Need help with rad valve never saw this one before

relymech Member Posts: 2
any help would be great thanks see attached picture. Yeah the invisible valve I can really say I never saw it before HAHA.

I hope you can see this one any help would be great.


  • Ironman
    Ironman Member Posts: 6,554
    We Haven't Either...

    Your pic didn't post.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • Paul48
    Paul48 Member Posts: 4,470

    Those invisible valves can be really challenging.
  • clammy
    clammy Member Posts: 2,666
    honeywell unique raditor valve

    That there is a honeywell unique raditor valve .These where installed on gravity hot water system .Take care when relocating the raditor and do not reduce the piping if you do relocate.When converting from gravity circulation to pumped be sure not to oversize your pump or you will have issues with system balance.I personally have only worked on 2 of these types of systems and have only seen maybe 4 or 5 of them in close to 30 years out in the field .Good luck and handle that valve with some special care it would be a hard search for a replacement but i do belilieve overtroupe makes a simalar type of valve for use in europe i would guess for raditors with one tapping there valve uses a inserted dip tube pretty neat stuff peace and good luck clammy
    R.A. Calmbacher L.L.C. HVAC
    NJ Master HVAC Lic.
    Mahwah, NJ
    Specializing in steam and hydronic heating
  • relymech
    relymech Member Posts: 2

    This is the first for me and I thought I had seen it all. I had a feeling that would require a tube to be inserted in Rad. The homeowner took it upon himself to take one out and ruined it. System was converted to circulation many years age. Looks like it my be time to modernize this system.
  • DanHolohan
    DanHolohan Member, Moderator, Administrator Posts: 15,425
    The Library

    has the patent for it. Here 'tis:

    Also, scroll a bit here and you'll see my take on it:

    Nice find!
    Retired and loving it.
This discussion has been closed.