You are correct, this is for a variable speed valve actuation. Speed control is the key here, position is not.
Confused,
First it was vertical lift of 100 lbs with 12 inch range and now it is variable speed valve actuation.
Likely can not give details on the net but a few more hints would be nice.
Since it for the day job I'll assume low cost hacks not acceptable.
Is it a product? Will long term availability of the system parts be a concern?
Have motion control systems in the field and in the shop built 40+ years ago. Now some fail (that sucks) and I am glad I designed around standard parts, mounts and connectors and controls.
(Along with please, please document the electrics and label the wires to the print)
I tell people to think that this machine may well outlive you and someone will have to fix it. Do you want them to love you or pee on your grave.
All this adds costs. A lot of cost.
A long life design or handful of years throwaway and tradeoffs? Five million cycle warranty or three months?
Bob
(I warned you many more questions)