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hot water radiator valves

tommy
tommy Member Posts: 2
in THE MAIN WALL
what is the reason for the pin hole in hot water
radiator valves?

thanks tommy

Comments

  • Mike T., Swampeast MO
    Mike T., Swampeast MO Member Posts: 6,928
    Pin-hole in valve

    To keep a touch of flow even when closed to make freeze-ups less likely.
  • Boilerpro
    Boilerpro Member Posts: 410
    However, that pin hole was sized for gravity systems...

    Put a pump on it and it can become hard to control the heat output of the rad.....there is no off position.

    Biolerpro
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