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What type of valve is this?

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ktully1973
ktully1973 Member Posts: 12
I am a HVAC guy who has very little experience with baseboard heating systems. My brother has a small leak and I want to give him a hand fixing it for him. It is in pretty badly oxidized, but I am pretty sure its a TMV. Please let me know what you think.

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  • hot_rod
    hot_rod Member Posts: 22,245
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    It does look like a mixing or diverting valve of some sorts. Clean it off better maybe.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • ktully1973
    ktully1973 Member Posts: 12
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    I took it to a pluming supply store they were stumped as well. There is only so much you can diagnose from a picture. I am going to go over tomorrow night to check it out.
  • Tinman
    Tinman Member Posts: 2,808
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    Almost looks like a cross with a vent on top?
    Steve Minnich
    ktully1973
  • ktully1973
    ktully1973 Member Posts: 12
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    A cross with a air vent on top.
  • hot_rod
    hot_rod Member Posts: 22,245
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    Stalagmite 101
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
    Ironman
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,605
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    Balancing valve? A split loop with (2) 1/2" returns coming into a common 3/4" return to the boiler
    Grallert
  • ktully1973
    ktully1973 Member Posts: 12
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    That is a pretty good guess. Where can I find one of these?
  • billtwocase
    billtwocase Member Posts: 2,385
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    Balance for a split loop with a failed coin vent? Drop the pressure, replace the vent, or best to plug it. Looked like an attic?
    ktully1973
  • ktully1973
    ktully1973 Member Posts: 12
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    Thanks for the assistance.