Mike,

I'm using two of them, for gear and for doors, and they seem to work fine. Try adjusting your ATV so that the valve is not fully pulled in. I can't say that I have thoroughly tested them. I've had them hooked up several times while installing the plumbing, working out the sequencing and figuring how many and where to locate the restrictors. Right now my equipment tray is out of the plane while I'm installing the engine.

Pull the plungers out and put some grease on the o-rings. Reinstall them and exercise the valve a few times. As I indicated above I have my ATV set so that the plunger does not move all the way in either direction. I'd guess I'm stopping about 1/16" short of full travel in each direction. Don't know if that is helping or not. Also make sure that your servo is not putting any side load on the plunger.

Joe