Yeah. In practice it's super simple and used in industry for yeeeaaars.
4-20 milliamp signal, air source and like he said spring or air for the "seat" so the valve doesn't over reach.
The compressed air idea is good.
Any gas or vapour can do work when it's expanded. It'll work like (again old industry tech) steam or gas engines expanding in the cylinder. About time it's introduced in a passenger car! Lol
"The most merciful thing in the world, I think, is the inability of the human mind to correlate all its contents... some day the piecing together of dissociated knowledge will open up such terrifying vistas of reality, and of our frightful position therein, that we shall either go mad from the revelation or flee from the light into the peace and safety of a new Dark Age."
-H.P. Lovecraft
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