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Valve Actuators

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Alan (California Radiant) Forbes
Alan (California Radiant) Forbes Member Posts: 4,077
in THE MAIN WALL
These valve actuators were originally available through Thermalese.  Does anyone know a source for replacements?
8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

Two btu per sq ft for degree difference for a slab

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  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes Member Posts: 4,077
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    Anyone?

    .
    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
  • hot_rod
    hot_rod Member Posts: 22,387
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    looks a lot like

    an earlier Wirsbo model, also. The challange if finding a replacement with the correct pin stroke. Then threads are all common, but the wrong pin dimension can hold the valve open, or not allow it to stroke enough to fully open.



    hr
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • tim smith
    tim smith Member Posts: 2,772
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    I remember those damn things

    Wirsbo had lots of problems with telestats back about 18 yrs ago. They made 3 mods until they got one that the wire on the heat motor would not break from a bad solder joint.  I am pretty sure the Wirsbo non heat motor telestat will fit right on there. You also adjust the pin position by rotating knurl nut until pointer lines up with green dot. Still available. Good luck
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