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Title: Selection Of Control Valves And Associated Instrumentation
Author: Phillip Murdock
Source: 1988 International School of Hydrocarbon Measurement
Year Published: 1988
Abstract: A control valve is a device placed in a fluid stream, gas or liquid, to control fluid flow based on demand. Control valves are used as a restriction to control pressure and/or volumetric flow of a fluid. A control valve used in throttling service allows fluid to be delivered at a controlled or throttled rate based on fluid demand. Pressure reduction is an application of control valves used in throttling service. In off/on service, a control valve is either fully open or fully closed. Examples of off/on service are control valves used for meter tube switching or for liquid level control. A control valve system consists of a control valve body, an actuator and a controller. Proper sizing and selection of each component is essential for a control valve system to provide desired process control, minimize initial cost, and minimize operation and maintenance expense.

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