OK, someone else has recommended a R/C high speed servo which can perform at .1sec at 90* and have 100in lbs of torque and cost less than 100 bucks. I am very inclined to look at this though I di not need or want R/C performance due to the concern of inconsistent performance. However, we could possibly bypass certain parts of the circuit. They run low voltage, have a gear set, are small, and may be worth looking at.
Thoughts??
EDIT: upon a closer look at secs, I guess the performance can be 100-400oz/in of torque so a little light on torque but I think we are on the right track with this. basically just a PWM input relative to what position we desire of the valve opening. Is there a similar device out that has a more robust build but similar in function, speed, etc? I think this is well on the right track but we do not require light weight really or near this compact. Do they make compact stepper motors or something with small gear reduction?