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Moving column cast iron radiator valve to outlet

rfriedman
rfriedman Member Posts: 6
in Plumbing

I am about to replace all the 1" right angle radiator valves with Dan Foss Thermostatic Radiator Valves. I intend to use wireless TRV heads to control them. These TRV heads require periodic replacement of the AA batteries. One of the radiators has the feed side (and its valve) tucked away in a fairly inaccessible corner. I would like to move the valve to the exit side which is more accessible. The general "on line" advice is "Don't do it". I think the valve will function properly with the flow pressure on the back side of the valve seat. What are the other down sides that I should consider when making this decision?

I am just using the TRV as a dumb off/on valve with a wireless thermostat located elsewhere in the room.

Comments

  • rfriedman
    rfriedman Member Posts: 6

    PS: This is a two pipe hydronic system

  • Jamie Hall
    Jamie Hall Member Posts: 24,881

    The valve will function with reverse flow as you propose — just not at reliably. However, I have to ask… is this system piped all parallel (home run) flow to a manifold? Otherwise… you may have some unpleasant surprises.

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    rfriedman
  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 9,404

    I installed several TRV’s a vintage Victorian home in Cape May. One of the valves was located on the return, unknowingly. That valve operated properly however there was a moaning noise that was determined to be the water flowing through the valve in reverse when it was close to, but not completely in the off position. So if you don’t mind listening to a ghost moaning through your home, go for it.

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

    PC7060
  • PC7060
    PC7060 Member Posts: 1,446
    edited November 29
    https://forum.heatinghelp.com/discussion/comment/1823076#Comment_1823076

    ^^^^ this! One rad had TRV on return, what a racket. This occurred when system pump was badly over sized and would push the valve open, valve would snap closed, at multiple cycles per second. ☹️

    That TRV got swapped to supply side right away.

    EdTheHeaterMan
  • PC7060
    PC7060 Member Posts: 1,446

    Can you install a remote sensing head in that location?

  • Kaos
    Kaos Member Posts: 227

    You can rotate the TRV (ie put the union nut on the piping and thread the body onto the rad). This way the flow would be in the correct direction on the return. Might needs some extra adaptors to make it work.

    PC7060EdTheHeaterMan

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