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  1. #1
    Join Date
    Jul 2007
    Location
    Chicagoland
    Posts
    479

    Vac-ing with ball valves

    I usually evacuate through my manifold, but I just got a set of hoses (Imperial) with ball valve ends and tested them. They vac and hold fine untill I turn the valve off then I rise to atmos. what gives? any one else?

  2. #2
    Join Date
    Jun 2008
    Location
    Las Vegas, NV
    Posts
    224
    Only thing I've noticed with mine is that full open isn't exactly that anymore. After about a year of service I open them to 45 deg. and all is well. No issue noted on closing.
    I tell bus. owners how much cooling costs...

  3. #3
    Join Date
    May 2004
    Location
    Rapid City, SD
    Posts
    7,415
    With the ball valves I've always opened and closed them a couple times before I hit a deep vac, help get the air trapped in the valve out. Not sure if that's what your encountering, or if they are just leaking.
    "If you call that hard work, a koala’s life would look heroic."

  4. #4
    Join Date
    Feb 2009
    Location
    New England
    Posts
    190
    really need the SuperEvac setup to properlly pull a fast vac in the field...youll never pull a deep vac with a manifold
    "Continuous effort - not strength or intelligence - is the key to unlocking our potential"

    Winston Churchill

  5. #5
    Join Date
    Jun 2008
    Location
    Rochester, NY
    Posts
    351
    I agree with the SuperEvac setup. As for the ball valves, make sure you turn them at least a quarter turn to get the air out that's trapped in them before your done vacuuming.

    -Mark

  6. #6
    Join Date
    Jun 2004
    Location
    Location:Raleigh NC
    Posts
    9,657
    Quote Originally Posted by amickracing View Post
    With the ball valves I've always opened and closed them a couple times before I hit a deep vac, help get the air trapped in the valve out. Not sure if that's what your encountering, or if they are just leaking.

    Me to
    If you help others then you are a Success

  7. #7
    Join Date
    Sep 2002
    Posts
    720
    Quote Originally Posted by Tie Strap View Post
    really need the SuperEvac setup to properlly pull a fast vac in the field...youll never pull a deep vac with a manifold
    Yes you can if your manifold is in good shape and you are using black hoses. I have both setups and there is no difference between them.

  8. #8
    Join Date
    Mar 2009
    Location
    central illinois
    Posts
    532
    we talked to the vac pump people can"t remember what brand. they told us not to pull throgh your manifold or charging hoses use black hose made for pulling vacuums and ball valves do trap air. take your valve stems out and see how quick it pulls down.
    work to live not live to work.

  9. #9
    Join Date
    Jan 2008
    Posts
    63
    i had those same vavles leak out of the package,tore them down and put leak lock on the threads good so far. but i prefer the super evauc kit for pulling down.

  10. #10
    Join Date
    Jul 2007
    Location
    Chicagoland
    Posts
    479
    I finally got around to a more thorough test and it looks like only the high side ball valve leaks under vac. and only at 3/4 closed. The others just hold ALOT of air and it takes several slow cycles (open-close-open) to clear them

    Black hoses are my ultimate goal, but Ill have a hard time giving up my 4 valve manifolds. Maybe if I ever convert Ill paint "NITRO" over the "VAC" knob




    Quote Originally Posted by local553 View Post
    take your valve stems out and see how quick it pulls down.

    I was just thinking about this the other day. Everybody talks about our VCRTs but nobody ever mentions pulling the core depressors out of their lines.

  11. #11
    Join Date
    Sep 2002
    Posts
    720
    Quote Originally Posted by AccurateHT View Post
    I finally got around to a more thorough test and it looks like only the high side ball valve leaks under vac. and only at 3/4 closed. The others just hold ALOT of air and it takes several slow cycles (open-close-open) to clear them

    Black hoses are my ultimate goal, but Ill have a hard time giving up my 4 valve manifolds. Maybe if I ever convert Ill paint "NITRO" over the "VAC" knob







    I was just thinking about this the other day. Everybody talks about our VCRTs but nobody ever mentions pulling the core depressors out of their lines.
    Either one of these work as well.




  12. #12
    Join Date
    May 2004
    Location
    Rapid City, SD
    Posts
    7,415
    Since you have 2 sets, you could go ahead and ship one to me, I'll store it in my van for you... you know, help you free up some space in your van.
    "If you call that hard work, a koala’s life would look heroic."

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