Unloader thread size?

  1. Stingray Member

    Messages:
    405
    Location:
    Northern Ireland
    Hi,
    I have a unloader valve that I’m going to install on a compressor I’m making, I am working away at present so am trying to source a few bits and pieces, the unloader valve is 1/2 bsp male to go into the tank, the other side is also male, I know it is a flared fitting, the od of the threads are 20.83/5 from memory and thread pitch is same as standard M12 bolt so is 1.75 and the flared seat (flared outwards) which is slightly smaller than od of threads is 45 degrees, does this thread size jump out at anyone as what it is, sorry I forgotten to take a few pictures but hopefully someone shall be able to tell Me the size of thread!

    Kind regards,
    Kev.
     
  2. MCKDAVID Member

    this is the detail I found for mine... made by NE-MA Pressostati in italy... hope that helps...

    upload_2019-11-14_16-19-9.png
     
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  3. 8ob

    8ob Forum Supporter

    Messages:
    4,423
    Location:
    moscow on thames
    If there is a flare in the bottom of the hole there is a good chance it’s to take a male jic pipe nut .

    Bob
     
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  4. Stingray Member

    Messages:
    405
    Location:
    Northern Ireland
     
  5. Stingray Member

    Messages:
    405
    Location:
    Northern Ireland
    792BF6CE-ADCA-4CE6-AC6F-5A65479F9F97.png Some JIC sizes here, I was only assuming the angle at 45 degrees so maybe is 37.5 degrees was what it was, 3/4 is a bit smaller than 20.8 but is 3/4 nominal size of threads in nut whereas I measured unloader valve male thread?
     
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