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Mixing Valve / Diverter Valve sourcing

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snoop
snoop Member Posts: 10
https://youtu.be/OSJkjcTHVLE?t=123

I am building a heating circuit just like the one in this youtube video with only one expansion tank on the primary circuit. It is suggesting that a diverter valve can be used however I am not sure where I can find one. Googling this item just returns shower mixing valves. If anyone is familiar with this and could link to an online retailer that would be helpful.

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  • Zman
    Zman Member Posts: 7,574
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    You would be mixing rather than diverting. Take a look at the TACO I-Series with outdoor reset 
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
    Rich_49rick in Alaska
  • snoop
    snoop Member Posts: 10
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    from what the video is saying is that diverting valves are desired so there is not cavitation in the auxiliary pump.
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,614
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    @snoop try supply house.com
  • Zman
    Zman Member Posts: 7,574
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    If you get rid of the check valve the problem also goes away. You don't need it. 
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
    Rich_49
  • Zman
    Zman Member Posts: 7,574
    edited November 2021
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    The valve CV rating shoud be as close to the design gpm as possible
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
  • snoop
    snoop Member Posts: 10
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    @snoop try supply house.com

    I can find the mixing valves but not diverter valves.
  • snoop
    snoop Member Posts: 10
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    Zman said:

    If you get rid of the check valve the problem also goes away. You don't need it. 

    I will be using a set point system so I can use it for a floor, with out a check valve then I would imagine hotter water could enter right?
  • hot_rod
    hot_rod Member Posts: 22,254
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    Or move the expansion tank to the secondary loop
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Zman
    Zman Member Posts: 7,574
    edited November 2021
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    Outdoor reset is perfect for radiant. As the heat loss decreases, the heat output decreases.
    If you are concerned about heat ghosting, a check valve at (or in) the circulator and or a heat trap would take care of that. There is no reason for the check on the return, what force is going to move water in that direction?
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
  • Rich_49
    Rich_49 Member Posts: 2,766
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    Important question and distinction is the fact that Dan is discussing a constant circulation system . Will you be using a constant circ loop ? Don't think so , you have no issues and do not require a diverter valve since your circ will apparently be off when there is no call for heat , especially if you use a setpoint mixer instead of the proper ODR unit . You could also use a 2 way or 4 way . Don't create problems where none exist . https://www.tacocomfort.com/documents/FileLibrary/102-145.pdf
    You didn't get what you didn't pay for and it will never be what you thought it would .
    Langans Plumbing & Heating LLC
    732-751-1560
    Serving most of New Jersey, Eastern Pa .
    Consultation, Design & Installation anywhere
    Rich McGrath 732-581-3833
    Zman