Always follow the control valve manufacturer’s maintenance manuals. Typical maintenance topics are summarized here together with recommendation to extend the life of the control valves. Optimization of control valve assets depends on an effective maintenance philosophy and program. Three of the most basic approaches are: Reactive – Action is taken after an event has occurred. Wait for something to happen to a valve and then repair or replace it. Preventive – Action is taken on a timetable based on history; that is, try to prevent something bad from happening. Predictive – Action is taken based on field input using state-of-the-art, non-intrusive diagnostic test and evaluation devices or using smart instrumentation. Although both reactive and preventive programs work, they do not optimize valve potential. Following are some of the disadvantages of each approach. Reactive Maintenance Reactive maintenance allows subtle deficiencies to go unnoticed and untreated, simply because there is
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