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

Left and right Radiator valves

I came across a steam radiator in a old catholic school in Brooklyn that has the radiator shut off valve and what appears to be a radiator thermostatic trap on the same side. Both have no unions so are L & R threads. Could anyone explain the history.


  • SteamingatMohawk
    SteamingatMohawk Member Posts: 984
    The only thing I can think of is like a turnbuckle for the last fitting or nipple because otherwise I have no clue as to how the parts could have been assembled, unless some joint is welded, glued or brazed.
    EBEBRATT-Ed Member Posts: 15,346
    They must have screwed the valve and trap on first and then screwed the pipes up through the floor
  • Steamhead
    Steamhead Member Posts: 16,736
    Definitely right-and-left-hand nipples. the threads in the valve and trap bodies are left-hand, while the ones in the rad are right-hand. You had to catch both threads and turn the nipple to tighten them up.

    What make was the trap?
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    RICK BONELLI Member Posts: 5
    I do not have the make of the trap. I do remember reading about this type radiator. I believe Dan H. wrote something about it. Did anyone read the article or posting?