Need info on installing a dump valve

Been eating at the lunch counter again, haven't you?

 

Really? Someone should tell the engineers at Fontaine, because they put my leveling valve on the rear axle and the dump valve, they put on it, only dumps the rear bags.

The supply line comes into the leveling valve and one line comes out to a T fitting, to supply the bags. One side of the T goes to the front axle, one side goes to the rear bags. The dump valve goes in the line from the T to the rear bags.

 

Autocar,have you ever used the the last axle dump for a longer time?


My point is that because the leveling valve is on the last axle,if that axle raises (or the chassis off the trailer goes down a little)it will lower the airpressure off the airbags off the front axle.
Which is something that would happen because you dump the air out off the bags off the last axle.
Unless Fontaine puts a block on the airlines going to the front airbags at the moment you dump the last axle.

 

I've screwed up and forgot to shut it off, on occassion, and yep, it keeps on dumping. However, a dump valve is not for running around all the time with it dumped. It is for dumping for the few seconds necessary to make the turn, then shutting off.
You stated that it won't work, with the leveling valve on the rear axle. The fact is, it does work at what it was designed for, which does not include leaving the rear axle dumped as you run all around Dixie.
Semi-Crazy's sketch is correct.

 

Correct.

While having a piece off pie(it is afternoon here) i had a rethink.
It can work for limited time.

So i guess we were both wrong and both right at the same time.
Isn't nice if 2 people can debate something and not have a fight?

 

When the trailer frame lowers the HCV will add more air. Since the rear dump valve is now blocking air to the rear bags the front bags will continue to fill with air until the HCV reaches it's neutral point again.

Have some more pie!

 

I don't know about spreads but with a tri- axle lifting the axle around a corner will get you cut back to 80k and a large $$$ ticket. And I don't eat lunch at a counter.

I know it's apples and oranges............


PS. I like blueberry ................

 

Correct sir.
Like i said i had a rethink.
And don't forget,it is New Year's Day,not when a person is at his prime in his thinking.
I didn't edit my previous posts with my mistake in ,as this would screw up the whole thread.


But do you mind if i stick too regular pie?


But here's another question for you,does the HCV limit itself to how much pressure it puts on the front bags?

 

I have never seen a HCV with a built in regulator. I have had my suspension guage over 120 psi.