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using check valves as pressure differential

Hey everyone!
I had an interesting question, i want to use a reverse indirect DHW with 2 pipe config. as my buffer tank and my hydraulic separation. From what i've seen the way to encourage the SH to take water from the buffer tank first is to install a pressure differential valve with a pressure drop of 2 psi. The only valves that i was able to find online were max 1-1/4" acc. to my load calc i would like to keep the piping sized to 1-1/2"


  • Big Ed_4
    Big Ed_4 Member Posts: 2,785
    A simple ball valve will work...

    There was an error rendering this rich post.

  • Jamie Hall
    Jamie Hall Member Posts: 23,324
    Big Ed_4 said:

    A simple ball valve will work...

    ... better. Because you can adjust it to suit.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • hot_rod
    hot_rod Member Posts: 22,158
    The intention of that valve is to prevent the system pump from pushing through the boiler  A typical hydronic spring check with a 1/2 psi pop is adequate
    The check in the circulator will work as also 
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream