My concept provides a much faster fluid flow mechanism into or out of a control device. The device could be hydraulic, pneumatic or any other fluid that must be controlled precisely.
Servo valve operators typically perform this function. However, typical servo valve operators must change their movement direction to initiate a downstream valve action. My concept avoids the typical change in direction of the servo valve operator (flapper device). This means no deceleration, movement stopping & subsequent acceleration to effect the downstream valve function.
The concept is infinitely variable depending upon the number of windows in the spinning members & the external stepper motor speeds.
Both spinning members & stepper motors could be concentric.
See the attached sketch.