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Stadler Zone Valves

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theowwm
theowwm Member Posts: 13
I have an older radiant manifold that uses Stadler zone valves. The control are a custom field-built setup that is 32 years old. I'd like to replace this with a Zone control like the Taco ZVC405. The Stadler valves are 2 wire 24 volt. Does anyone know if these will work with the Taco or similar controller? Thanks




Mad Dog_2

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  • mattmia2
    mattmia2 Member Posts: 9,735
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    They will but those heat motors and that manifold are also obsolete and difficult to get parts for. Sometimes there are adapters that allow you to use available parts but if you're replacing things you probably want to consider replacing the manifolds too.
    Mad Dog_2SuperTech
  • SteveSan
    SteveSan Member Posts: 235
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    When wiring 2 wire zone valves to our ZVC controls, just need to jump 3-4 as shown in the attach photo.

    If you have any questions, please give Taco Technical Services a call during normal business hours Mon-Fri 8am-5pm EST 401-942-8000

    Mad Dog_2
  • hot_rod
    hot_rod Member Posts: 22,251
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    Those are probably the older high current draw actuator, so see if the current draw is listed on those actuators, to know how many will work on a 40Va transformer.

    Possibly some of the new 250 ma actuators will fit, it depends on the pin stroke, may as well run those until they fail.

    Really should use sealed actuators on inverted manifolds to keep any pex fitting seeping from hitting the heat motor. Caleffi 6564 is a sealed actuator for inverted mounting.

    Caleffi ZVR 106 has two 40 Va transformers in parallel, for 80Va total. A relay box is a good idea to clean up that rats nest wiring :)

    At some point it may be wise to replace the entire manifold. Is that tube a metric size, do you know?

    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
    Alan (California Radiant) ForbesMad Dog_2
  • theowwm
    theowwm Member Posts: 13
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    Thanks for the info on the controllers. I've definitely been thinking about replacing the manifolds. The tubing and connectors is the reason I haven't done that yet. I can't find any markings on the tube so far, but the connector is a Beulco DIN 16mm:


    These are the same manifolds that I'm trying to fit air vents to.

    Thanks again
  • theowwm
    theowwm Member Posts: 13
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    Funny... All I had to do was look at the fitting. As it turns out, the manifolds are also made by Beulco and are still in production. Beulco also has a 24 volt actuator. Not sure how interchangeable the parts are to the old manifolds, but it's at least somewhat promising.


  • hot_rod
    hot_rod Member Posts: 22,251
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    theowwm said:

    Thanks for the info on the controllers. I've definitely been thinking about replacing the manifolds. The tubing and connectors is the reason I haven't done that yet. I can't find any markings on the tube so far, but the connector is a Beulco DIN 16mm:


    These are the same manifolds that I'm trying to fit air vents to.

    Thanks again

    16 mm is .629, so a 5/8" pex fitting may work.
    Our pex fittings have a
    segmented olive and a tapered insert with dual O rings, so they fit
    a range of tube size or out of dimension tube.

    Check with that manufacturer and see if any changes have been made over the years. If not stick with their parts.

    If you need actuators, stems, pex fittings, might just buy the entire manifold?
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Mad Dog_2
    Mad Dog_2 Member Posts: 7,099
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    What State are you in?  I've never come across them...Mad Dog 🐕 
  • theowwm
    theowwm Member Posts: 13
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    I'm in Northeastern MA.
  • theowwm
    theowwm Member Posts: 13
    edited October 2023
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    After doing some digging, I was able to find a local supplier for for these manifold components. It seems these were sold as Stadler OV type manifolds. The replacement parts are made by Beulco. The Supplier is Radiant Alternatives from East Windsor, CT. Here's the flyer for the manifold parts:



    I ordered the fittings, valve bodies, and air vents. I had them in hand the following day. This is a big relief as I thought I'd be replacing these manifolds, which would have meant a bunch of re-piping. I I also got all the legacy relays out and replaced with a Taco ZVC405 controller. Controller powers the valves with no issues. It also is a lot less complicated and neater.

    Thanks to all who commented.

    mattmia2