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Different valves?

Ghynes440
Ghynes440 Member Posts: 51
in Oil Heating

what is the difference between these two? Why does the old one have a larger body. Do I need to go with a large body like the old style? This is for a hot water boiler system.

IMG_3277.jpeg

Comments

  • Jamie Hall
    Jamie Hall Member Posts: 26,299

    The probability that the union half on the new valve will fit with and seal with the union half on the stub from the old valve is somewhere between slim and none.

    You will need to remove the stub from the radiator and replace it with the stub which should have come with that new valve.

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • mattmia2
    mattmia2 Member Posts: 13,942

    The old one might have a larger seat. Are they both 3/4" in and out? Probably doesn't matter much on a pumped hot water system, could make a difference on a gravity system.

  • Ghynes440
    Ghynes440 Member Posts: 51
    https://forum.heatinghelp.com/discussion/comment/1863934#Comment_1863934

    yes I am removing that union part as well

  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 10,909

    the new valve will work just fine.

    Edward Young Retired

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

    Ghynes440
  • hot_rod
    hot_rod Member Posts: 25,541

    the old valve could be a globe valve, they have that large rounded shape. They are a more linear action valve. The seat and valve disc may be a tapered design

    It is a better valve for regulating flow than a flat disc compression type valve, and still a good shutoff valve

    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Jamie Hall
    Jamie Hall Member Posts: 26,299

    OK… I'll ask the dumb question. What's the matter with the old one, other than it needs a good wire brushing? There isn't much that can go wrong with those things that can't be fixed in an hour or so…

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    mattmia2
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 18,419

    The old one is worth more at the scrap yard

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