Need info on installing a dump valve

Discussion in 'Flatbed Trucking Forum' started by Southern Flyer, Dec 31, 2012.

  1. Southern Flyer

    Southern Flyer Bobtail Member

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    Sep 21, 2012
    Rockmart, Ga
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    Hey folks, I'm sure what I need to know is posted in here somewhere but I cant seem to find a clear enough explanation so I'm gonna ask for some advice. I've got a 98 utility combo spread, the leveling valve is on the rear axle and controls all 4 bags and I've stared at it trying to figure this out but I'm obviously missing something. I want to put a dump valve on the rear axle and control it electrically in the cab. I got the whole wiring thing covered, I'm needing to know what valves do I need, how to hook it up and any other info you all might know about it. I'm trying to prolong my tires as much as I can and I've heard a dump valve is a good start. Any help would greatly be appreciated and I hope everyone has a great new year and we all make some money
     
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  3. Semi Crazy

    Semi Crazy Road Train Member

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    May 13, 2011
    Middle Tennessee
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    Try drawing it on paper. That's what I do on a plumbing project... and some staring!

    All you need is one of these.
     
  4. Southern Flyer

    Southern Flyer Bobtail Member

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    Sep 21, 2012
    Rockmart, Ga
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    I tried drawing pictures, lookin at it then drawing a few more pictures and the end result was a bunch of pictures that looked like hell and a headache from staring
     
  5. Semi Crazy

    Semi Crazy Road Train Member

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    Middle Tennessee
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    The line from the height control valve goes to the front bags and tees from them to the rear. Chop that line to the rear bags and put the valve inline. One port is supply, one port (common*) will go to the other half of the line you chopped that goes to the rear bags and the other port is vented to the atmosphere.

    *common means that port will always be open to one (air supply) or the other (atmosphere) port.
     
    Last edited: Jan 1, 2013
  6. Southern Flyer

    Southern Flyer Bobtail Member

    31
    8
    Sep 21, 2012
    Rockmart, Ga
    0
    Well I dont think mine is quite set up like that, I'll try to explain so bare with me....on the left and right side there is a 3/8 air line that runs from the front bag to the rear bag, then there is a T on each side kinda up on the top, off of those lines that come down behind the crossmember right behind the front axle that T into the line coming out of the HCV. the other line on the HCV goes to the air tank and the pressure valve for the air supply. so its like all the bags would drop if I put one on it instead of just the rear like I need. Whoever had this trailer before I got it installed a single line off the left rear bag to a ball valve with a gauge on it for who knows what but I can open it up and bleed the air off to squat the ### end. I'm just like #### could it be set up any more crazy
     
  7. Semi Crazy

    Semi Crazy Road Train Member

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    Middle Tennessee
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    Aw heck I meant the rear bags not the front! Hey it's New Years Eve, I may or may not be sober! i'll go back and edit
     
  8. Semi Crazy

    Semi Crazy Road Train Member

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    May 13, 2011
    Middle Tennessee
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    here

    [​IMG]

    just pretend the dump for all four bags ain't there. just imagine a straight line from the HCV to the T before the rear dump valve.
     
  9. daf105paccar

    daf105paccar Road Train Member

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    Apr 15, 2012
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    Cannot work with the valve there.
    When you dump the rear axle,all the bags will lose pressure.:yes2557::yes2557:
     
  10. amscontr

    amscontr Light Load Member

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    Dec 12, 2010
    Illinois
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    Just be careful when and where you dump the air off your rear axle out in public. The "right" DOT cop will pull you over and make you split weigh your trailers axles with the air dumped off the rear, just a little FYI.
     
  11. ralph

    ralph Road Train Member

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    Mar 1, 2009
    At The Key Board
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    Connect the dump line to an extra air tank, it will deaden the noise of the air exhausting.
     
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