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2015-06-08View Original

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This post was last edited by Asker on 2015-6-8 at 22:11. There are two valves: one that closes when air is applied in the forward direction and one that opens when air is applied in the reverse direction (in both cases, the valve moves downward when it closes). Mechanical positioners are used for these valves. When the feedback rod comes loose, gravity causes it to drop to the lowest position. At this point, the DCS sends a 12mA signal – how should these two valves be controlled based on this signal?

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