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Anyone recognize this TRV?

Steamhead Member Posts: 16,826

It's one of several in a church we're working on, and is probably 20-30 years old. There are no markings on them whatsoever. They want to install more TRVs, and keep the same model if possible. Thanks in advance for any information.
All Steamed Up, Inc.
Towson, MD, USA
Steam, Vapor & Hot-Water Heating Specialists
Oil & Gas Burner Service


  • reggi
    reggi Member Posts: 510
    edited March 2022
    @Steamhead Whoever got the first Patent..it looks that old 

    Just keeps reminding me of Honeywell but Danfoss keeps showing up but they all seem to be embossed 
    One way to get familiar something you know nothing about is to ask a really smart person a really stupid question
  • Intplm.
    Intplm. Member Posts: 1,941
    The head looks like a Danfoss. The body I have never seen before. Might be a very early Danfoss.
  • ScottSecor
    ScottSecor Member Posts: 855
    Just did a quick search of your image and came upon this website. Looks like the body may be a Danfoss RAVL.
  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 7,818
    edited March 2022
    OMG... I do recognize him... His name is Dan.... I was friends with his brother Lukas.

    Edward F Young. Retired HVAC ContractorSpecialized in Residential Oil Burner and Hydronics
  • Hap_Hazzard
    Hap_Hazzard Member Posts: 2,846
    Remember his other brother, Joe?

    Just another DIYer | King of Prussia, PA
    1983(?) Peerless G-561-W-S | 3" drop header, CG400-1090, VXT-24
  • Larry Weingarten
    Larry Weingarten Member Posts: 3,286
    Hi @Steamhead , I looked all over the web and found some similar valves in style and finish, (all Danfoss) but nothing exactly matching. Anyone have some old Danfoss catalogs?

    Yours, Larry
  • Steamhead
    Steamhead Member Posts: 16,826
    Thanks, all- I'll call Danfoss and see what they have to say.
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
  • Dennis1679
    Dennis1679 Member Posts: 24
    The head looks like an ISTA but the body not so much. I installed a lot of them a long time ago, maybe over 25 years ago.