On July 19, 2017 at 12:40, ceied said...
i used to own the company that made ultra valve. electronically controlled shower valve... it would do what you want. but i sold out 20 years ago and they have since closed up shop.
you can search for indiustrial flow water control devices... i know things like this exist for process control. sorry i cant be more help...
search for your local industrial pump rep and ask for insight.
Awesome,
Thank You
