Sizing and selection of control valve for process control loop

The purpose of this paper is to provide an understanding of the key issues involved in the sizing and selection of control valve for typical process control applications. Control valve is the most common final control element of process control loop. It manipulates a flowing fluid to compensate for the load disturbance and keep the regulated process variable as close as possible to the desired set point. So proper sizing, selection, manufacture, test, installation and maintenance of control valve are all significant to obtain precise control performances. This paper proposes better flexibility for sizing and selection of appropriate control valve and it's accessories to ensure the best control performance and safety of process control loop in a cost effective way.