Need info on installing a dump valve

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

  1. Bent Wrench

    Bent Wrench Medium Load Member

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    Aug 11, 2009
    Cornholio, OR
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    A dump valve will not raise the dumped axle.
    The tires will still be on the ground.
    Dumping the air on the rear axle will reduce the scrub pressure and make the trailer steer/pivot on the front axle.
    Not something to do fully loaded as you will overload the front axle.
    Less scrub less tire wear and a better turning radius (watch the tail swing though).
     
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  3. Bent Wrench

    Bent Wrench Medium Load Member

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    Cornholio, OR
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    Flyer: you are going to have to do some extra plumbing

    1. Plug one rear feed (at the front)
    2. Tie the two rears together
    3. Install dump valve in the rear feed line
     
  4. Southern Flyer

    Southern Flyer Bobtail Member

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    Sep 21, 2012
    Rockmart, Ga
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    AirBags1.jpg ok this is what Ive come up with, maybe this will work like I think
     
  5. olphart

    olphart Medium Load Member

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    Minden,LA
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    That won't work. You have to keep each side separate or it will turn you over in a curve.
     
  6. Southern Flyer

    Southern Flyer Bobtail Member

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    Sep 21, 2012
    Rockmart, Ga
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    ok well the way it was originally then I just need to adjust from there....Bent Wrench when you said plug one rear feed at the front, where did you mean at.
     
  7. Semi Crazy

    Semi Crazy Road Train Member

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    May 13, 2011
    Middle Tennessee
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    Perfect! Simple isn't it?




    WHAT WHAT WHAT?:biggrin_2551: Oh snap January Fool's Day joke!
     
  8. Bent Wrench

    Bent Wrench Medium Load Member

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    Aug 11, 2009
    Cornholio, OR
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    I suppose that might be possible on paper but, only with really large hoses and no anti-roll bars on the suspension.

    I am not a guru but, I have never seen a large hose system that did not have anti-roll bars.
    Actually the only large hose systems I have seen are on the back of a tractor and they use short bags and have anti-roll bars.

    The HCV does not keep the sides separate all 4 are tied together, so what keeps it from rolling over then?
     
  9. Bent Wrench

    Bent Wrench Medium Load Member

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    Aug 11, 2009
    Cornholio, OR
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    That looks good.
    My only concern would be that the HCV (it appears) is not on the axle being pressurized and could lead to some funky behavior, especially when on uneven ground.

    Keep in mind that the DOT bumper may drag on steep inclines (driveways) with the rear axle dumped.
     
  10. Southern Flyer

    Southern Flyer Bobtail Member

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    Sep 21, 2012
    Rockmart, Ga
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    Hahaha, y'all can tell I probably didn't get an A in art class, Wrench the HCV is on the rear axle. I was thinking the whole flipping when going into a curve didn't make too much sense cause they are all ran off one HCV now, what's y'all's opinion on the solenoid I've got, do you think it'll do the job or should I go with something different. It's pouring rain here in GA and seems to never end cause Mother Nature hates anyone who is trying to get stuff done outside and particularly me cause I try to keep my truck clean. You all have been a great help and if there is anything I can help you all with let me know, I was a diesel mechanic long before I started driving and obviously other than dump valve installs on a trailer I'm pretty good with other stuff.
     
  11. olphart

    olphart Medium Load Member

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    Feb 15, 2009
    Minden,LA
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    The valve has a line for each side. They are isolated inside the valve.
     
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