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Which way is on

bluejlewis21
bluejlewis21 Member Posts: 2
in Radiant Heating
How can I tell which way is on and off on an old valve with no markings
Mad Dog_2

Comments

  • HVACNUT
    HVACNUT Member Posts: 6,506
    What does it say under the handle?
  • Jamie Hall
    Jamie Hall Member Posts: 25,387
    Unless it is really truly weird, clockwise will close it down -- but maybe not off. That looks like a throttling valve, not a stop valve.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    Mad Dog_2Intplm.
  • DanHolohan
    DanHolohan Member, Moderator, Administrator Posts: 16,610
    Yes, it’s a throttling valve. Those holes probably indicate levels of heat, typically, each space equals 10 square feet of EDR. Turning it clockwise should close it. 
    Retired and loving it.
    mattmia2Intplm.
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 16,999
    Looks like it says "ON" under the handle.
  • mattmia2
    mattmia2 Member Posts: 11,343
    DanHolohan said:

    Yes, it’s a throttling valve. Those holes probably indicate levels of heat, typically, each space equals 10 square feet of EDR. Turning it clockwise should close it. 

    Oh and there is a screw in the back or something like that that lets you move the stop on the right to a different hole so you can set it to match the emitter so it doesn't put steam in the returns?

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