An Asian fibreglass manufacturer uses electric valve actuators at several of its plants. Raw fiberglass material in pellet form is transported from a hopper into a furnace and melted. Globe control valves must accurately control the ratio of natural gas and oxygen supplied to the furnace to melt the raw glass. The correct mixture ensures good combustion and provides a lean burn, saving both gas and oxygen. The melted material is then extruded into fine threads of fibreglass which is sprayed with water to cool. The cooled threads are reeled into coils and sold as the finished product. As this fibreglass application illustrates, an increased focus on production costs and efficiency means that accurate control is vital. With resolution figures better than 0.1% and the ability to eliminate position overshoot, the Rotork CVA helps to maximise product quality and plant capacity. Rotork’s CVA set-up and calibration is carried out non-intrusively with a Bluetooth™ enabled PDA using the freely downloadable Rotork Enlight software, so that no access is required to the main electronics compartment during commissioning. In addition, the terminal compartment is separately sealed, eliminating the risk of moisture ingress during installation.
