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Thread: Pneumatic quick release fittings

  1. #16
    Join Date
    Nov 2003
    Location
    Central North Carolina
    Posts
    1,830
    Whatever you do, stick with one manufacturer and style. I found out the hard way that mixing brands, even though the fittings were visually identical, gave me problems. I now buy only one type from only one source.

    Charley

  2. #17
    Join Date
    Nov 2012
    Location
    New England, in a town on the way to nowhere
    Posts
    537
    I've been using the ype M for 30 or more years with no complaints as long as you use a good brand of fitting. Cheapies don't last and almost always leak. The type M is the most widely used in this area too, making it easy to 'borrow' air on site.

  3. #18
    Join Date
    Feb 2007
    Location
    augusta, GA
    Posts
    367
    So I ended up buying Milton type A fittings. They are push to connect, steel, look sturdy, and provide a good solid fit between coupler and plug. However, I have a leak between a female coupler and the male 1/4" NPT fitting on the hose. I brushed Oatey great white pipe joint compound on the male threads and tightened the joint moderately, but had an obvious leak. I then took the joint apart, put a heavy coat of joint compound on, and tightened the joint almost as tight as possible just using wrenches. The leak is much better but still detectable with soap suds. Not sure what I'm doing wrong here so any thoughts would be appreciated. Do I need to wait several days for the joint compound to cure? Do I need to torque the joint as tight as is humanly possible? Is it a bad coupler or pipe fitting? Thanks.

  4. #19
    My new rapid air system instructions say to put 2 wraps of the teflon tape on your fittings, and then use the pipe dope. Could be a bad thread, most of that stuff is chinese made now, and they turn out some reject parts.

  5. #20
    Join Date
    Feb 2007
    Location
    augusta, GA
    Posts
    367
    Thanks Jim. I'm slowly figuring this out. I bought some heavy duty Teflon tape (gray in color, and perhaps 2-3x as thick as the normal white stuff), and put 2-3 wraps around the male joint and then tightened it moderately. That seems to work pretty consistently for an airtight leak. However, now I'm having problems with the barbed fittings for hoses. I'm using a 3/8 fitting for a 3/8" ID rubber air hose. The barb goes in a little easier than I expected, but does take a little force to pull out. I then tighten a small wormgear clamp on the fitting until rubber starts to protrude through the worm gear slots. And sometimes that's not tight enough to prevent a slight leak. Any trick to this that I'm missing? Do I need to wrap some Teflon tape onto the barbed fitting?worm clamp.JPG

  6. #21
    One thing you may want to look into is Oetiker style clamps and an inexpensive crimping tool. Worm clamps are just too clunky for my taste but you may not mind them. They will clean up the ends of your hoses if you have to assemble them in house.

    An even better option is to find a local hydraulics shop and have them crimp standard brass ferrules on the ends for you. Its worth a few bucks.

    There is no need for tape on the barb.

  7. #22
    Join Date
    Jan 2006
    Location
    Grand Forks, ND
    Posts
    2,336
    We use Milton "m" at work. They are very inexpensive and work well, I dont think any Milton style will serve you wrong. FWIW, the aluminum ends do wear out, but in a hobby shop it will take awhile.
    A bus station is where a bus stops. A train station is where a train stops. My desk is a work station.

  8. #23
    Join Date
    Jan 2006
    Location
    Grand Forks, ND
    Posts
    2,336
    Quote Originally Posted by Mark Bolton View Post
    One thing you may want to look into is Oetiker style clamps and an inexpensive crimping tool.

    I'd second that advice. If you choose to stick with a screw type clamp, find some fuel injection hose clamps, they clamp more evenly and dont dig into the hose. You can wrap the clamps in electrical tape or heat shrink to make them a little less grabby.
    A bus station is where a bus stops. A train station is where a train stops. My desk is a work station.

  9. #24
    Join Date
    Mar 2006
    Location
    SoCal
    Posts
    22,492
    Blog Entries
    1
    A no-go feature for me is a collar that is not protected from impact release. The type that have a solid ring protecting the collar mechanism don't pop loose when you drag them or bump them against something. Beyond that I am pretty open.

    No.no.JPG Yes.yes.JPG
    Last edited by glenn bradley; 03-02-2014 at 2:09 PM.
    "A hen is only an egg's way of making another egg".


    – Samuel Butler

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