Chapter VI

Final Control Element

Abstract

ISA guidelines are followed for final control element (FCE) sizing and noise calculations, and discussions on special phenomena flashing fluid, cavitations, critical velocity, etc., are included. Materials of construction, dimensional details, and types of control valves and their applications are covered with special reference to drag and variable resistance trim type valves. Apart from control valves, other methods such as damper blade pitch control, speed control by hydraulic coupling scoop tube, and VFDs with special reference to IGBT are covered. For actuators, special discussions on for their selection and an application note are found for both diaphragm and piston actuators. Also conventional and ...

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