Me personally, I do NOT remove the cable from the power valve body- Still plenty of room to remove the cleaning valve from the assembly (& Springs)
Some have removed the entire actuator to get the powervalve assembly on the bench- I guess that works too.
In-all, I have found if you don't mess with the inital adjustment of the cable from the power valve body to the actuator- you will be fine.
This is just how I do it- others will tell you different