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Cast Iron hot water valve adjustment

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Jerryrw
Jerryrw Member Posts: 4
The old cast iron radiators in the house I'm working on are hot water and bottom piped on both sides. Instead of just an elbow on the return side, there is a valve with a lock nut and screw adjustment. Feed side has traditional knob adjustment. Cant find any info on this double valved arrangement specifically how to adjust heat on individual radiators. Thanks

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  • Ironman
    Ironman Member Posts: 7,385
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    Post some pics, please.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • nicholas bonham-carter
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    What symptoms are you having with this system?
    The valve on the return was most likely set, and locked as an upper limit to the flow through the radiator, to prevent overheating of the room.
    This may also be an old steam system, now converted to hot water—NBC
    Jerryrw
  • Jerryrw
    Jerryrw Member Posts: 4
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    Ok I will post some pics. The prob is this radiator overheats the room. Thermostat is in another room and wanted to adjust it (radiator) for less heat. Not sure which valve to use, since I've never worked with these before. Thanks