We have bled the cylinder but it only fixes the issue for a few hours and then it starts relevelling again. It does it worse on the top floor but when the public start entering the museum and using the lift it will do it on all 3 floors.
The valve is adjusted well and comes into floor ok. It can start relevelling 5 to 10 times when people walk into it from any floor after not being used. It also happens when people leave the car, they step out and the lift pops up 5 to 10mm obviously because the weight has left the car and it starts relevelling.
All stages seem to be in sync as there is no evident jolt as each stage ascends from the other. This valve only has 3 solenoids, DP (low pressure), DZ (overload), Up and Down.
It also has a blain L10 door lock valve.
Yes, we checked the rails and guides weren't binding up at the top but the fact that it can do this on any floor depending on the amount of people that enter the lift is concerning. It's just more prominent on the top floor as it can happen with a loaded or empty car on the top floor, it has to have a load entering or leaving the car for it to happen on the other 2 floors.
I would post a video on here but I don't think I can.
I have uploaded a couple of photos of the cylinder.
