Rotary-shaft Control Valves are available in several different types, each characterized by the geometry of the closure member (disk, ball, ball segment or plug). Compared to sliding-stem valves, rotary-shaft valves typically have limited pressure drop ratings, are less expensive, have greater rangeability and provide greater flow capacity for a given valve size. Rotary valves typically are selected to provide unique features, such as high capacity (full-bore ball valve), shear on closing action (ball segment valve), low cost (standard butterfly) or resistance to erosion damage. In general, rotary-shaft valves offer fewer severe service options (trim options to attenuate Control Valve noise, eliminate cavitation and provide other desirable characteristics).

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