Detection Method for Stiction of Pneumatic Control Valve with Fieldbus Communication

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Control valve (CV) is one of the important final control elements. If CV unintendedly takes control action because of its internal failure, the process becomes unstable, at worst, industrial accidents occur. Stiction is the most commonly occurred as the internal failure of CV. However, it has been difficult to detect the stiction, because operators have not been able to get the internal information of CV from traditional instrumentation. In these latter days, Fieldbus has been widely implemented. It is possible to get the internal information by using Fieldbus instrumentation. In this study, we developed a method for stiction detection of pneumatic control valve via Fieldbus communication. The effectiveness of the detection method was demonstrated by the laboratory equipment with the flow control system.