This rotary ball control valve video (courtesy of MOGAS) provides an informative look at the flow conditions inside a valve designed with a tortuous flow path and specialized characterization.
The Flexstream rotary control valve uses a standard ball valve body with a very specialized ball. As the ball opens, the video shows the tortuous path. The design allows for volumetric expansion when controlling gas. Velocity, noise and cavitation are controlled by repeated 90 degree turns in the flow path. This design is excellent for applications that require wide range-ability.
