Rotork has launched an electric valve actuator for the operation of process control valves. The Rotork CVA range provides continuous, repeatable modulating control with a programmable fail-to-position option operating on an industry-standard 4-20mA control signal or digital bus. The resolution, repeatability and hysteresis performance of the CVA is quoted at <0.1% of full scale. It is available for the direct-drive actuation of linear or quarter-turn control valves. Mechanical features include Rotork double-sealed enclosure. The IP68 dust tight, watertight and temporarily submersible (7m, 72 hours) enclosure is universal to all models in the CVA range. Actuator set-up and configuration is performed using a Bluetooth enabled PDA or PC running Rotork Enlight software that is downloadable from the Rotork website. Every CVA incorporates an onboard data logger, enabling operational data such as valve-torque profiles, dwell times, actuator events and statistics to be downloaded for investigation and diagnosis. When complete, the full range of CVA actuators will have a maximum rated thrust of 22.2kN with a maximum stroke of 114.3mm, while quarter-turn actuators will supply a maximum rated torque of 677.5Nm, enabling the range to operate most control valve types and sizes.