Actuator increases the scope of electric control valve technology

08 May 2012

Rotork Process Controls has launched CMA (Compact Modulating Actuator), a new range of compact, robust electric actuators designed for control valves, regulators and other continuous modulating applications.

The CMA extends the scope of Rotork’s existing technologies and is designed to leverage features of the CVA electric control valve actuator range. The CMA range increases the areas of flow control that can take advantage of these advanced features.

The Rotork CMA is available in linear, quarter-turn and multi-turn versions, facilitating the operation of numerous types of control valve, damper and pump stroke adjuster applications. Single-phase or DC electrical power supply is all that is required for control valve actuation, saving the on-going costs associated with the operation and maintenance of instrument air supplies.

The maintenance-free CMA drive train, permanently lubricated and protected in an IP67 watertight and, where required, explosion-proof enclosure, can be mounted in any orientation. says the company. Accepting 4 -20mA command signal, it promises the delivery of repeatable positional control. Resolution is 0.25% on linear and quarter-turn applications and 2 degrees on the multi-turn configuration.

Continuous and unrestricted modulating performance is provided by a brushless DC motor, magnetic contactless sensors and a lubricated for life drive train.

Actuator configuration is performed in a logical, menu driven process using pushbuttons and an LCD display window. User selectable adjustments are provided for speed, dead band, zero and span, command signal type, standard or reverse action and loss of signal position.

Manual operation is available as standard whilst optional extras include local pushbuttons and selector switch, digital position indicator and digital communication connectivity with HART, Foundation Fieldbus and Profibus.

Applications for the CMA are expected to include choke valve, metering pump and associated duties in oil and gas processing and storage, mining and mineral industries, as well as process skids and plant for equipment such as boilers, separators, injectors and heat exchangers.

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