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Installing check valves in a two zone system.

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JackW
JackW Member Posts: 236
I am redoing my radiant heating system in my Morton building, all piping is 3/4". It is a two zone system, each zone is controlled by a pump. In the old setup I kept the temperature in zone 2 higher and never had to set the thermostat in zone 1 because the zone 2 pump would pull water past the zone 1 pump heating zone 1, not as warm as zone 2 but ok. I want to put check valves ahead of the pumps to prevent this parasitic draw but I'm afraid the 3/4" check valves will restrict the flow. When in the open position the stopper hangs partially down which I would think would restrict the water flow. Is this a concern or not? Any thoughts on this will be greatly appreciated.

Thanks,
Jack

Comments

  • Zman
    Zman Member Posts: 7,575
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    Unless your pump sizing is marginal, the addition of the check should not be an issue.
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
    JackW
  • JackW
    JackW Member Posts: 236
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    Good to know, thank you for your response.
  • Simply Rad
    Simply Rad Member Posts: 184
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    Grundfos 3 speed pumps come with integral check valves
    Jeffrey Campbell
    JackW
  • JackW
    JackW Member Posts: 236
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    Thanks Simply Rad I'll look into that.