Hydraulic Fitting Same As A Pneumatic Fitting

  1. Pollys13

    Pollys13 Member

    Messages:
    328
    Location:
    Wiltshire UK
    I've bought a low pressure regulator, rated 0.05-2 BAR. It has 3 x 1/2 ports also bought a pair of 1/2 x 3/8 male bushings.

    I assume a hydraulic blanking plug for the rear port, for this application is just as good as a pneumatic plug?
    Cheers.
     
    • Hydraulic Fitting.jpg
  2. Munkul Member

    Messages:
    1,163
    Cumbria, UK
    As long as it seals on the face, then yes :)
     
  3. Pollys13

    Pollys13 Member

    Messages:
    328
    Location:
    Wiltshire UK
    So should I remove that rubber ring?
     
  4. Munkul Member

    Messages:
    1,163
    Cumbria, UK
    nope, that's your seal. As long as the regulator also has a flat face for it to seal against, you'll be fine.

    The "correct" fitting (and I'm guessing here) is a BSP tapered thread plug with thread tape, that's the usual air fitting thread, either that or NPT (similar enough to BSP to usually work)

    The parallel thread face seal will work though
     
  5. Hopefuldave Intergalactic pot-mender

    Messages:
    1,136
    Location:
    The Shed of Danger, surrey, England
    I've been looking on EvilBay for a couple of flow meters/peashooters and a tee so I can run backing gas in pipes/tubes, they all just say "3/8 thread", no clue BSP or NPT, will they seal well enough (with a wrap of tape if needed)?

    Dave H. (the other one)
     
  6. Pollys13

    Pollys13 Member

    Messages:
    328
    Location:
    Wiltshire UK
    OK thanks.
     
  7. carbon

    carbon Member

    Messages:
    1,254
    Location:
    S. Glos. U.K

    3/8 bsp and 3/8 npt are close and will fit together but it can be hard work after a couple of revolutions.
     
  8. Munkul Member

    Messages:
    1,163
    Cumbria, UK
    Most welding related 3/8" fittings are BSP thread... in fact all of them I've came across, anyways. Probably some NPT fittings out there but it's a good gamble it's BSP
     
  9. addjunkie

    addjunkie Member

    Messages:
    5,449
    Location:
    Northumberland. Reet oot in the sticks
    Some thread sizes, half inch in particular are dangerously similar, the difference is NPT is 60 degree thread angle, the BSPP is a parralel thread, BSPT is the taper, the BSP thread form is 55 degrees.

    If you buy a fitting and it doesnt screw in almost all the way by fingers, it isnt right.

    If you do force NPT and BSPT or parallel for that matter, they may go in buy coming out they tend to gaul and damage the softer usually the internal thread badly.
     
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