[GORDON HUMMEL]

I'm still confused. The valve(s) on the frame that connect to the axle with a rod are commonly referred to as HCV, Height Control Valves. I have 2 of these, one on each side, just inside the inside duals, mounted to the frame.
On my Newell, the HCV receive line pressure air through the bottom center port of the drive axle 6 pack. The output of each of the HCV goes back to the 6 pack right side top & bottom & enters the manifold through the travel solonoids. When the travel solonoids are open, that air pressure go out of the 6 pack on the left side to the pings tanks and on to the air bags.

On my Newell the tag axle does NOT have HCV's for traveling. Travel height is controlled by a single regulator, through the tag axle 6 pack.

I have 4 airbags on my tag axle. Mid to late 90's, Newell changed to 2 airbags on the tag axle. These have one 6 pack, but 4 additional solonoids on the chassis. The tag travel height on these Newells is controlled by the the drive axle HCV. A drawing of this is posted.

I have a drawing somewhere of my original setup & I will post it soon.

ALL NEWELLS ARE DIFFERENT, but work somewhat the same!