Need info on installing a dump valve

I kinda just went through this in November with my 2007 Fontaine Renegade.
I might have a post here somewhere about that.

I used Hendrickson parts directly purchased.
They sell an HCV with a built-in-dump (for all 4 air springs) and then I also tied in the dump valve for
the rear air springs as indicated in the drawings earlier in this thread
The HCV has 2 outputs so I didn't need to "T" off the line before the rear spring dump valve.

The HCV with autodump was under $100 and the dump valve solenoid was under $75.
(The Fontaine came with a Peter Paul or Peter Pan something valve that shorted and was very spendy to replace)

I did have to run a new air line (split off from AHEAD of the reservoir) and buy DOT fittings but it works well.

-I hit the switch and it will dump the rear air springs in less than 10 seconds.
-I engage the trailer brakes and all 4 air springs drop fully in under 12 seconds.
(Nice for loading/unloading heavy coils)

 

Yep, I ran 10-ton Dragon Wagons at Ft. Hood in 1973-1974.

 

sorry if this was said already as i didnt read every post, but i would suggest that whatever selonoid you use it should dump under power as opposed to inflate under power. i had one that had to have power to inflate the rear bags and it was a pain because if a connection became bad it would let the air out and would keep dumping until you found and fixed the bad connection

 

Wow some people have strange misconceptions of a spread axle air ride!

Go with electric solenoid. Electric travels faster than air, plus it doesn't freeze! If your leveling valve has two outlet ports you can run one port to the front and the other to the back. Use the quick release as the T for your airbags. You do have to watch some solenoids have a max psi they will allow. I have an old Peter Paul one and it is limited to 100psi I think.



Want some fun....sort this out..lol. It got cold on me so I haven't been able to finish it up correctly. Plus I'm gonna get ride of that style solenoid and go with another style. I can dump both axles from the cab.

 

of coarse its an electric selonoid but there are 2 kinds one need power to dump and one needs power to inflate i bought the wrong one and learned my lesson, so just trying to make sure this guy doesnt make the same mistake

 

Normally CLOSED.
Dump should only need power to OPEN the exhaust port

 

When I wired up my electric rear axle dump I installed a manual valve to dump all four bags. Comes in handy for short docks and to get the trailer lower for tarping, chaining etc...

 

This depends on which way you want to do it and also which style quick release you use.

The cheaper way to go is with a normally open and te cheap quick release valve.

 

Normally Open or Normally Closed depends which port you attach the lines.

In a 3-way the common port is always flowing to a closed port and an open port. The electric just moves the piston so the open port is now closed and the closed port is now open.

So N.O. or N.C. depends on how you attached your lines. You swap lines on the non-common ports and the valve is N.C. instead of N.O. or vice versa of what it was before.