August 2017

Maintenance and Reliability

Does your control valve talk?

Pneumatic operated control valves (POCVs) are consistently the most used control final element for process control across most industries—in some cases, they are also part of the safety instrumented systems (SISs) layer.

Almas, A., Palmela

Pneumatic operated control valves (POCVs) are consistently the most used control final element for process control across most industries—in some cases, they are also part of the safety instrumented systems (SISs) layer. Independent from valve type (globe, butterfly, ball, segmented ball, plug, gate, disc, angle, etc.), control valves are key aspects of process control success, and can utilize 60%–70% of controls and instrumentation maintenance budgeting for planned activities in most refining and petrochemical plants under maintenance shutdown, followed by some specific process analyzers. FIG. 1. An angle valve-type control valve with full pneumatic contro

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