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A clever Calefactio pump iso valve, check ∆P

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hot_rod
hot_rod Member Posts: 22,158
in THE MAIN WALL
1/8" gauge ports, rotating flanges, and you can purge from either side, depending on handle position.
Bob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream
SuperTechGroundUp

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  • Jamie Hall
    Jamie Hall Member Posts: 23,327
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    neat gadget!
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • Ironman
    Ironman Member Posts: 7,376
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    Who's got 'em?
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • STEVEusaPA
    STEVEusaPA Member Posts: 6,505
    edited September 2020
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    Would you (could you) use that (and maybe a globe valve) instead of circuit setters?

    There was an error rendering this rich post.

  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes Member Posts: 4,011
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    Hard to track down, but I purchased mine about a year ago from Hajoca, Salt Lake City (855) 982-1408; ask for Vern.
    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
  • Tinman
    Tinman Member Posts: 2,808
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    I considered those for my system but went with a single pressure gauge and two ball valves piped in parallel to the pumps. It decreases the margin of error which could be significant for residential applications. 
    Steve Minnich
  • STEVEusaPA
    STEVEusaPA Member Posts: 6,505
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    Steve Minnich said:

    I considered those for my system but went with a single pressure gauge and two ball valves piped in parallel to the pumps. It decreases the margin of error which could be significant for residential applications. 

    So for the circulator, you close one valve to read one side, and then switch it and read the other side?

    There was an error rendering this rich post.

  • Tinman
    Tinman Member Posts: 2,808
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    @STEVEusaPA Yep, and then do the math. 
    Steve Minnich
    STEVEusaPA
  • Tinman
    Tinman Member Posts: 2,808
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    I get that it’s not practical to do what I did on job sites. It’s my personal system and I like bells and whistles. 😎
    Steve Minnich
    STEVEusaPA
  • mattmia2
    mattmia2 Member Posts: 9,672
    edited September 2020
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    I'd be inclined to pipe the 2 taps to either side of something like a Dwyer differential pressure gauge of a low full scale but higher max pressure value so that you can calculate flow in systems with low resistance.

    When I experimented with trying to measure flow with a single high precision gauge and a 3 way valve to toggle it between the inlet and the outlet of a balancing valve, I was never sure if I was really getting the differential or if the system pressure was fluctuating more than the differential across the valve.
  • hot_rod
    hot_rod Member Posts: 22,158
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    Or a simple Y hose across the two valves, with the single gauge.
    I only have one valve to demo this :)
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Tinman
    Tinman Member Posts: 2,808
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    Yeah I like the idea of using something like that as a test instrument. 
    Steve Minnich
  • mattmia2
    mattmia2 Member Posts: 9,672
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    I did basically that. A pump probably has enough delta for that to work. When i did it across a balancing valve it was iffy if the variation was because of the differential across the valve or fluctuations in the pressure in the system at both points.

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