2015 Volvo new leveling valve, new problem

This is a 2015 Volvo. My leveling valve died last week, leak in diaphragm. It only lasted 920k so I'm ok with it. Replaced with Barksdale valve, pretty similar, which was the dealer replacement part. Fittings were laid out different but I got everything in the right place.

When installed, new valve had truck perfectly level sitting where my mechanic told me it should.

Grabbed a 25k load right by the house and truck rode fine that day. Next day grabbed a 40k load and ran another 500 miles, no problems.

Delivered load and today ran a light short load with some empty deadhead between and noticed this problem. When bobtailing or pulling empty trailer airbag pressure will slowly rise until the ride is rock hard, jar your fillings out hard. I can get out and look at bags and they look like they are about to blow. My truck has a digital psi gauge in the menu on the dash. Bobtailing when things are level and riding well it's always at like 10 psi, empty trailer about 15 psi and I've learned to get pretty close on my drives weight using this gauge. If I've got a 40k load it's up around 50 psi but right now it's creeping up to 30 PSI without any load at all.

I have to manually dump the bags now and then but it will slowly creep back up. Doesn't seem to be happening with some weight on the trailer.

tomorrow I've got a 10k load for a few hundred miles and will see how it does but what's going on?

Weird thing is looking around online I found some Youtube comments on a Volvo leveling valve replacement video and some people have had this same problem but no answers there, just several people describing same problem looking for an answer.

 

Yep, I have. This afternoon I changed the arm to one setting lower. My frame has different holes for moving the arm to calibrate. My gut says bad valve too but it was really weird to find these Youtube comments with a bunch of other people having the same problem with new valves. That makes me think it's gotta be something else.

 

Thanks yall, I'll see about replacing the valve.