Do large butterfly valves use a power actuator to rotate the disc?

Large butterfly valves typically do use a power actuator to rotate the disc. The purpose of a power actuator in this context is to facilitate the precise control and positioning of the valve's disc, which regulates flow through the pipeline. In applications where the valve size is large or the pressure and flow requirements are significant, manual operation may be impractical or cumbersome.

Power actuators can be electric, pneumatic, or hydraulic, and they provide the necessary force to open and close the valve efficiently. This ensures that the valve operates smoothly and reliably, reducing the risk of wear or damage that could occur with manual handling. Thus, the use of power actuators is essential for optimal functionality, particularly in large-scale industrial applications where precise flow control is crucial.