Food & Drink Process & Packaging Issue 15 2017 - Page 19

Rotork electric valve control contributes to Coca-Cola Enterprises environmental improvements Rotork CVA electric control valve actuation technology is helping Co- ca-Cola Enterprises (CCE) to increase efficiency and reduce energy costs at its Wakefield production plant in the UK. An important part of the plan involves saving the on-going cost of provi- ding and maintaining an instrument air supply for traditional pneumatic control valve actuation. This is being implemented by the introduction of the Rotork CVA control valve actuator to perform modulating and failsafe valve duties. A recent example is on the production line where the adoption of Rotork CVA technology for a demanding valve duty has considerably reduced Above left, a Rotork engineer demonstrates the improved control valve performance illustrated by the Rotork CVA actuator’s datalogger. Top right, These two graphs show the improved positional accuracy of the CVA actuator in comparison with the pneumatic actuator in the production mode. Above right, These two graphs show the improved positional accuracy of the CVA actuator in comparison with the pneumatic actuator in the CIP (Clean in Place) mode. the cost of energy consumption when compared with traditional pneumatic actuation with no loss of performan- any leaks in the system. ce. “Up to now, electrically actuated val- Andy Reynolds, Automation Engineer maintain good pressure control in the at the Wakefield plant, explains: bottle filling machine. Rotork were “We wanted to remove the need for compressed air as much as possible in the area and reduce costs. Based on average air usage of 2m3/hr for ves could not respond fast enough to confident that their CVA actuator would not only give a similar per- formance to our existing valve, but would also be cheaper to run. a 3” control valve at £0.05 per m3, “To prove this, the performance of the the running cost would be £870 per existing pneumatic control valve on annum. The CVA actuator, using an the main product feed into the filling average of 10 Watts at £0.15/kW, machine was first monitored and would cost £13 for the same period. recorded. The CVA actuator was then This represents a minimum saving of fitted to the same valve and connec- £857 per annum per valve, as this fi- ted to the existing 4-20mA control gure does not take into consideration signal from the PLC. “After running and monitoring the CVA actuator in a 24-7 operation for one month, the results from the two actuators were compared. The graphs clearly show that in production mode the CVA performs equally well, if not better than the pneumatic actuator. However, when in Clean in Place (CIP) cleaning mode, the performance of the CVA is much better than the pneumatic. This is because the CVA actuator does not overshoot the set point like the pneumatic actuator does when the set point is lower and back pressure in the circuit is higher when in CIP mode.” FDPP - 19