Rotork CVA Selected For Demanding Control Valve Duty
The 6inch Class 150 ball valve controls the flow from a storage tank to fuel oil pumps. The changing load on the units demands virtually continuous modulation to maintain the correct flow. It was decided to replace the existing pneumatic I/P positioner and spring diaphragm pneumatic actuator with the CVA electric actuator because it provides extremely precise control valve operation with repeatability and resolution performance at less than 0.1% of full scale.
In addition to the convenience of all electric control and operation, the CVA uses wireless Bluetooth communication technology for swift and user-friendly actuator set-up, auto calibration and adjustment. Further benefits include comprehensive performance data-logging, a double-sealed IP68 watertight enclosure for environmental protection and programmable fail-to-position options using integral super-capacitors. On-site technicians carried out extensive tests on the fail-to-position feature and verified correct performance in both loss-of-power and loss-of-signal situations.
The CVA data-logger stores operational data such as valve torque profiles, events and statistics that can be downloaded for detailed analysis using Rotork Enlight software. By anticipating potential problems, preventative maintenance can be planned without interruption to the operation of the plant.
Rotork Controls Ltd
Tel: 01225 733200
Published in Valve User Magazine Issue 17
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