Enhanced functionality for process valve actuators

03 March 2015

Rotork has advanced its CMA electric actuation technology for the operation of process control valves, introducing new options to meet evolving customer and market requirements.

The latest developments allow the CMA design to be specified with increased functionality encompassing local controls, LCD positional display and programmable fail-to-position performance.

Designed for quarter-turn, rotary or linear operation, the robust actuators can perform numerous process control valve, metering pump and damper applications demanding precise position control and continuous modulation. 

Single-phase or DC electrical power is now all that is required for installation and control valve actuation. Explosion proof certification to international standards is available for hazardous area applications.

Local controls can offer manual operation at the valve, combined with a vivid LCD display of valve position which also incorporates critical and non-critical fault symbols. Control selection knobs enable selection of Local, Stop or Remote operation and Open or Close input commands in the Local control mode. Each mode can be locked in place to prevent unauthorised operation. The LCD display shows the valve position as a precise percentage of total valve travel.

For fail-to-position performance, a reserve power pack provides the actuator with the ability to perform a predetermined action on power failure. The power pack also preserves position indication on the LCD display during power failure. Upon restoration of mains power, the power pack quickly recharges to ensure continued fail-to-position functionality. 

The maintenance-free CMA drive train, environmentally protected to IP67 and permanently lubricated for operation in sub-zero temperatures as standard, can be mounted in any orientation. 

Accepting an industry-standard 4-20mA control signal, the actuator provides accurate, repeatable and backlash-free positional control. Resolution is 0.2% on linear and quarter-turn applications, 2 degrees on the multi-turn models. All CMA actuators have output speeds that are adjustable down to 50% of full speed in 10% increments and manual operation is provided as standard. Network compatibility encompasses Rotork Pakscan, HART, Profibus, Modbus, DeviceNet and Foundation Fieldbus. 

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