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Part identification help!

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evanczekuc
evanczekuc Member Posts: 3
edited October 2023 in Radiant Heating
Can someone tell me what this is? I'm thinking it's a old flow check but I'm not sure


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  • Steamhead
    Steamhead Member Posts: 16,889
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    How is it piped into the system?
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Consulting
  • pecmsg
    pecmsg Member Posts: 4,883
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    Post a shot from further away.
  • ScottSecor
    ScottSecor Member Posts: 863
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    Maybe use the flash on your phone or camera?
    mattmia2
  • mattmia2
    mattmia2 Member Posts: 9,741
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    pecmsg said:

    Post a shot from further away.

    And with light and in focus.
  • evanczekuc
    evanczekuc Member Posts: 3
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    I added another picture. There is one on each zone.
  • mattmia2
    mattmia2 Member Posts: 9,741
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    Is there a screw slot or a hex on the end? Looks like an old style isolation or balancing valve.
  • evanczekuc
    evanczekuc Member Posts: 3
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    There's a hex on top AND on the side.
  • reggi
    reggi Member Posts: 522
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    I added another picture. There is one on each zone.
    The second unit looks like perhaps it was overtightened and the body cracked. . Though neither one really appears to be something serviced until there's a problem.,. So are you having a problem?


    One way to get familiar something you know nothing about is to ask a really smart person a really stupid question
  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 8,068
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    one on each zone? are they circulator zones? then they are flo-check valves if there are no other anywhere else on the loop (zone). otherwise the zone that is not calling will have water moving backwards depending on the amount of resistance that loop has compared to the path thru the boiler.


    looks a lot like this thing.

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

  • rick in Alaska
    rick in Alaska Member Posts: 1,457
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    If it has an arrow on it, it is a check valve.
    Rick
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,616
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    I agree with @rick in Alaska

    Looks like a check , could be a flow check. For me the pipe hole with a plug in it that is on a 45 gives it away.