Belimo is the end-all, be-all for smaller applications IMO. Now if you start talking 6" and larger I use the Bray.I have used Belimo SS ball valves with proportional actuators (1 - 10) volt signal, 24 vdc supply. These are used as control valves in HVAC applications and are usually found for reasonable prices on Ebay. The valves have a removable disc for flow limiting, which when removed will give a 3/8" opening in the ball.
The main question would be what the controller will be, is it capable of proportional voltage or current output, or just binary.
If proportional voltage is available then that is the easiest way, If binary then you need to look at floating control actuator.
Good to know. Thanks!Now if I were to do it from scratch now, I would go with @BrunDog valves. The valves he sells have a visual status on the valve itself and additionally have a manual control in case something is not working properly on the computer or with Brucontrol. Obviously that should be a very rare case, but it is nice to have that as a just in case. The valves he sells do cost a bit more than the US Solid or the Baco Eng on Amazon. Also I could not find any 3 way outside of what @BrunDog offers. I am still running manual 3 ways, but do want to change out eventually.