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  1. #1
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    Vacuum Rating Tools to 20 Microns with NIST-Traceable Gauges

    We've been asked many times to explain how the MegaFlow Valve Core Removal Tool ("VCT") is "Rated to 20 Microns," and how our tool differs from others. This video is a small-scale example of our testing process, showing the equipment and method we use to make sure we can backup our claims. We only use NIST-traceable micron gauges, so that we can be confident in the results of our testing.



    The small volume of the VCTs makes leaks much more "visible" to a micron gauge, as there is less room for leaked molecules to "hide." This is one of the hardest tests to get a valve to pass, especially when using a micron gauge that keeps you honest.

    While some people have had limited success with "fresh off the shelf" tools staying below 300 microns when "blanked off," the problem we encountered with other tools was the vacuum performance after a dozen uses (or less). Once the initial packing grease around the o-rings has worn in, the other valves may become very unreliable in holding a deep vacuum.

    We were essentially driven to make the MegaFlow VCT just so we could develop and test the Tez8 in the field; we needed tools that would consistently hold a deep vacuum, so we made them.

    Also, the video mentions the VCT Maintenance Video, that's being wrapped up and we'll be publishing it soon.

  2. #2
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    Looks like a wireless gauge there sending a reading to a phone.
    Is that available?

  3. #3
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    Quote Originally Posted by itsiceman View Post
    Looks like a wireless gauge there sending a reading to a phone.
    Is that available?
    X2.

    Where can I get an Appion AV760 Micron/Vacuum Gauge?

  4. #4
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    May 2006
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    ChrisP:

    Where's the Valve Core Removal Tool maintenance video mentioned in this video located at? Just looked at your site and only found a CRT tool usage video.

    Ah! I see that mentioned in your post! My bad!!

    Interested in the video as I was told that I may have damaged "O" rings and/or seals with cleaning fluid but the problem turned out to be my BluVac LTE which is on its way back to Accutools right now.
    Last edited by wptski; 05-09-2014 at 03:01 PM.
    Bill

  5. #5
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    Thread Starter
    Quote Originally Posted by itsiceman View Post
    Looks like a wireless gauge there sending a reading to a phone.
    Is that available?
    Quote Originally Posted by Brent Ridley View Post
    X2.

    Where can I get an Appion AV760 Micron/Vacuum Gauge?
    We are in the process of releasing new products this season, including the gauge shown here. It's doing what you see here... and more.

  6. #6
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    Thread Starter
    Quote Originally Posted by wptski View Post
    ChrisP:

    Where's the Valve Core Removal Tool maintenance video mentioned in this video located at? Just looked at your site and only found a CRT tool usage video.

    Ah! I see that mentioned in your post! My bad!!

    Interested in the video as I was told that I may have damaged "O" rings and/or seals with cleaning fluid but the problem turned out to be my BluVac LTE which is on its way back to Accutools right now.
    The main things the maintenance video covers is proper attachments, closing the valve halfway during evacuation periodically, and an overview of the assembly for replacing o-rings. Also, our kits come with a diagram showing how to do the o-ring changes.

  7. #7
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    Quote Originally Posted by Appion-ChrisP View Post
    The main things the maintenance video covers is proper attachments, closing the valve halfway during evacuation periodically, and an overview of the assembly for replacing o-rings. Also, our kits come with a diagram showing how to do the o-ring changes.
    This seems to be something I had to figure out pretty quick in the field. Whatever you last opened and closed your CRT on gets stuck in the valve, when you open and close the valve again under vacuum it gets released. I do it twice now, once in the 20,000 area and again around 1,000 microns, when I do my blank off test I don't have problems anymore.

  8. #8
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    Quote Originally Posted by Appion-ChrisP View Post
    The main things the maintenance video covers is proper attachments, closing the valve halfway during evacuation periodically, and an overview of the assembly for replacing o-rings. Also, our kits come with a diagram showing how to do the o-ring changes.
    I had numerous emails with Appion and they were nice enough to send me "O" rings for free. I removed the old ones and tried to reinstall but as I suspected, they had swelled to the point, they couldn't be reinstalled. From what I've read they can swell just from refrigerant and oil exposure but I had previously used Heptane based Pasolade Cordless Tool Cleaner to clean one of the two CRTs I own. It wasn't allowed to soak but was blown out immediately.
    Bill

  9. #9
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    is there a trick to using the core removal tools when a system is charged? I have a brand new appion crt and a yellow jacket crt, as well as a cps crt and the one one that works best when removing a core with a system under pressure is the cps. i have practiced at my house too and just can't seem to have any success.

  10. #10
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    The appions are aweful at removing valve cores. I have to use my YJ plunger.

  11. #11
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    Quote Originally Posted by northeastbeast View Post
    is there a trick to using the core removal tools when a system is charged? I have a brand new appion crt and a yellow jacket crt, as well as a cps crt and the one one that works best when removing a core with a system under pressure is the cps. i have practiced at my house too and just can't seem to have any success.
    The trouble here is the lack of standardization of the pin-tip of the valve core. If we make the tool "loose" enough to catch worn, corroded, and oversized pins, then the tip won't always remove cores when the system is NOT under pressure.

    We have a range of valve cores that EVERY tip is tested on, and the tip has to grab the core on the first try to pass the test. Either you have a "new" tool from old stock, or the valve cores you are working with are of a shape or condition we couldn't account for.

    One thing to try is to put a drop of clean vacuum pump oil in the hole at the end of the tip, and then put a valve core into the tip to work the oil into the gaskets. If this doesn't improve the function on new valve cores (that is, corroded cores are problematic no matter what), then send me a message and we'll get you taken care of.

  12. #12
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    Quote Originally Posted by Appion-ChrisP View Post
    We are in the process of releasing new products this season, including the gauge shown here. It's doing what you see here... and more.
    I see a one piece quick connect coupling attachment too

  13. #13
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    Quote Originally Posted by jtrammel View Post
    The appions are aweful at removing valve cores. I have to use my YJ plunger.
    Have you tried putting a valve core into the plunger and checking to see how tight the fit is? Might just need to squeeze it down a little, with a core in it. I had the opposite problem on this oddball style york core on the suction line, I spread the plunger jaws out a little and it fit.

    What I've found is even if the core doesn't come out you can still tell if you got it unscrewed, you can then usually valve it off take out the plunger, pop the valve open real fast and it will shoot the core out.

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