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Comment PDF Automation & Control

Improving Control Valve Performance

By James Beall, Emerson Process Management |

Improvements to the performance of basic, regulatory control systems have a great return on investment and are some of the least expensive control improvements to make [1]. Control valves have a major impact on control loop performance and, therefore, improvements in valve performance can have significant economic benefits. This article shows how poor control-valve performance can be identified and corrected to achieve these benefits. A plant example is used to demonstrate these methods. In addition to corrective actions, comprehensive control-valve specifications, based on process requirements for new applications, can provide quicker plant startups and immediate economic savings. The control valve system In this article, the control valve is considered to be a dynamic system, from the input signal through to the flow coefficient that determines the fluid flowrate through the pipe. The control valve system includes the valve, actuator, motion conversion mechanism, stem or shaft, closure member (such as plug, ball or disc) and other valve accessories. Examples of valve accessories include current to pressure transducer (I/P), positioner, air booster relay, dampener and air set. So, when a change of the input signal to the control…
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