Rotork ActuatorRotork’s CMA series of all-electric modulating actuators are sized for linear, quarter-turn and rotary control valve and pump applications requiring precise position control and continuous modulation. They can be powered by single-phase or direct-current supplies, eliminating the need for air hoses and compressors used with similar pneumatic control valve actuators. Set-up and configuration is done via push buttons and an internal six-segment LCD display. Resolution is 0.25 percent on linear and quarter-turn applications and 2 degrees on the multi-turn configuration. Other features include a permanently lubricated and maintenance-free drivetrain; a 4-20 mA loop-powered, feedback signal; and digital communication options including HART, Foundation Fieldbus, Profibus, Pakscan, RIRO, and Modbus. The new CMA actuators complement Rotork’s CVA electric control valve actuators. –