Yes, there's lots of building automation / HVAC stuff that uses pneumatic signalling/actuation (like the infamous T-4002 thermostat, look up images of it, you've probably seen it before!).
Amusingly enough, lots of those pneumatic systems use 3-15 PSI signalling, which works the exact same way that 4-20 mA signalling works -- with a live zero so breaks in circuits can be detected!
Early in my career, I did some work on what was essentially a Foundation Fieldbus to 4-20ma adapter. To get it to control our pneumatic valve for a demo, we wired it to a 4-20mA to 3-15PSI converter and then to the valve itself. It was a bit Rube Goldberge-esque, but it served our purpose well.
Amusingly enough, lots of those pneumatic systems use 3-15 PSI signalling, which works the exact same way that 4-20 mA signalling works -- with a live zero so breaks in circuits can be detected!