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Hydraulic separator question

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CBRob
CBRob Member Posts: 273
edited October 2023 in THE MAIN WALL
I have seen the light and can appreciate the simplicity of a hydraulic separator from caleefi.
I was wondering what this little fitting was at the top of the separator. Kind of looks like a check valve? It's where the air vent goes.

There's also a brass screw on the front that is an opening for an accessory port I think.
Is that meant to put pressure gauges and temp gauges in?

Comments

  • CBRob
    CBRob Member Posts: 273
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    This fitting 
  • hot_rod
    hot_rod Member Posts: 22,467
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    That is a service check. Screw a 1/2" air vent into it. Then you can remove the vent for service without draining pressure.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • CBRob
    CBRob Member Posts: 273
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    Is there a check valve in the thermowell on the front?
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,829
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    If it is a thermowell why would you need a check valve?
  • GGross
    GGross Member Posts: 1,105
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    I believe they are just plugged and if you want to use the well for a sensor you buy one one of these




    Alan (California Radiant) ForbesCBRob
  • CBRob
    CBRob Member Posts: 273
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    Can you simply thread in a pressure / temperature gauge into that thermo well?
  • GGross
    GGross Member Posts: 1,105
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    I think its a straight thread not standard NPT. Although between you and me, and definitely do not tell @hot_rod. I saw a guy pipe his expansion tank off that well port before, and it still hasn't leaked yet.
  • hot_rod
    hot_rod Member Posts: 22,467
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    I have heard of people, like myself, wrapping a number of turns of teflon tape to seal a male NPT into a female BSP thread.

    But you cannot go the opposite BSP male into NPT female. Easily :)

    Check is for the top port where the air vent goes.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream