Adjusting the expansion valve?

[applepod124]

My Mini Vivaldi II has recently been having an issue with the pump where it will not stay at 9 bar consistently throughout the shot. When I start the pump, the pressure jumps up to 9 then quickly drops to 7. Near the end of the shot, in the last few seconds (20-25s), the pressure jumps between 7 and 9 bar. The pump makes a pulsing noise as this is happening. I called chris's coffee, and they suggested that I adjust the expansion valve, after verifying that the pump does reach 10 bar using a backflush disk. How do I adjust the expansion valve? Will this correct the issue or could it be something else? I tried searching for instructions on how to do it but was only able to find info about the vivaldi, not sure if it's the same.

Thanks!

[chas]

Have you looked at paragraph 8.1 of the User's Manual?

s1v2/MiniV2Manual/Mini_V2_Owners_Manual_RevF.pdf

[applepod124]

I checked that and noticed that there is a kink in the tube leading to the expansion valve, could that be causing an issue?

[chas]

That could do it.