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Specification sheets for selecting automated valves list requirements for the valve and actuator but often lump all other devices together as related instrumentation or accessories.

Like anything made of metal, valves are subject to corrosion and other natural forces that compromise their performance. However, the right coating can protect those valves not just against corrosion, but erosion and wear.

In any control system, the option potentially exists to select either a control valve or a regulator, so it is useful to compare the respective performance and economics of these approaches to arrive at some general selection guidelines.