Electric control actuator for choke valves
In the latest development of its range of CMA electric control valve actuators, Rotork has introduced a new version specifically designed for the demands of choke valve operation.
Built with extensive industry experience, the CMR-250/GB3 actuator meets exacting requirements for low power, high torque modulating control in a compact package for applications including severe service upstream wellhead production and injection valves.
The low power requirement and a 24VDC option enables solar powered and battery back-up supplies to be introduced in remote locations, whilst the all-electric technology delivers considerable system simplification and economy in any environment by eliminating the on-going costs associated with an instrument air supply.
Easily adaptable to suit any type of valve, the CMR-250/GB3 delivers a maximum output torque of 45 Nm. Available for a range of single-phase or DC power supplies, the design combines a brushless motor with permanently lubricated, high efficiency gears to achieve accurate, responsive and continuous modulating control. Rotary output speed is adjustable down to 50 percent of full speed.
The compact actuator enclosure is environmentally sealed to IP67 as standard and available with ATEX, IECEX, FM and GOST hazardous area certification. The wide ambient operating temperature range (-20 to +65 degrees C for explosionproof models and -30 to +70 degrees C for watertight models) facilitates long-term reliability and maintenance-free operation in the harshest of environments.
Actuator set-up is performed in a logical menu-driven process using an internal electronic 6-segment LCD display and pushbuttons. User selectable adjustments encompass speed, dead band, zero and span, command signal type, standard or reverse action and loss of signal position. A standard 4-20mA signal is used for control and feedback, whilst digital network options include Rotork Pakscan, HART, Profibus, Modbus and Foundation Fieldbus. A hard-wired RIRO (Remote-In-Remote-Out) option is also available.