I have to control a regular shower electronically. I have been having problems selecting the right valve + actuator, I need a very compact design.
Does anyone know a company or any hints on how could I find a small "electronic valve" that handles normal house low pressure.
Your problem would probably be finding a small enough ready available mixing Automatic Control Valves.
Googling '3-way motorized mixing valve' would give you an oppurtunity to search nearby available types.
My another suggestion is that  you should Keep the existing valve.  And Add a servo to it.

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