By C Sailaja & A Gugharaja
Valves commonly used in process industry are either pneumatically operated or electrically operated depending on the availability of instrument air/power at that location and its application. The control and monitoring of the valves shall be from the control room. This involves a large amount of cabling from the field/ MCC, junction boxes, IO cards, etc. With the advancement in technology, valve operation on digital communication system has been introduced.