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Thread: check valve placement

  1. #1
    DIY Member msgale's Avatar
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    Default check valve placement

    can a one inch swing check valve be placed in a vertical pipe and still worK? Or do they have to be horizontal?

    It's for near-boiler piping, to prevent domestic hot water heater usage improperly getting hot water to the house hydronic system in summer

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    A little more info would be required. There should not be any cross-coupling between hydronic and potable water. Do you have say a demand type system in your boiler you shut off for the summer and use a tank instead? I'd consider just using a valve(s) to shut one off and open the other.

    Check valves can (normally) go horizontal (properly oriented) or vertical. If this is for potable water, you'll need probably a bronze, SS, or plastic approved for potable water use. Being hot may create some other problems.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    DIY Member msgale's Avatar
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    this is for the water heated by the mod-con boiler in a hydronic system. Now, its a primary/secondary set of loops, one zone only.

    The revision is to add an indirect water heater. For summer use of the water heater, i need check valve to protect against boiler-heated water going thru the house radiators.

    none of this is potable water. the heated hot wster for human use is on a separate set of pipes

  4. #4
    Plunger/TurdPuncher kingsotall's Avatar
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    Indirect water heater. Check valve goes after DHW pump before the tee where the return from the sysytem goes into the boiler. On the verticle is fine with a swing check.
    Might want to wait for Thatguy, nhmaster or HJ to weigh in with their opinions.
    I just post cuz I like to see my avatar.

  5. #5
    Master Plumber nhmaster's Avatar
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    What you need is a flow check valve which is not like a regular swing or ball check in that it has a weighted gate. Check out www.taco-hvac.com What you probably want is a Taco 219.

  6. #6
    DIY Member msgale's Avatar
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    Default i can't find 219 in taco, is ther another name?

    tried the web site, no luck

  7. #7
    DIY Member msgale's Avatar
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    Default OK, found the 219...

    How is that different or better than a plain swing check valve?

  8. #8
    Master Plumber nhmaster's Avatar
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    The check in a standard swing check is not heavy enough to always stay closed against thermal migration. A flow check has a heavier check assembly.

  9. #9
    DIY Member msgale's Avatar
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    ok, sounds reasonable, thank you , all of you, for the info.
    I love this board

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