Safety integrated functions for valve manifold

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Efe

I am trying to incorporate a safety functionality to detect if a manual valve is open or closed at a valve manifold. Can anyone offer some guide as to how this can be done?

The process control system used for this is a Delta V system. And there are flow meters. The fluid in the pipes are either single, two or three phase of Air, Water and oil. Their are some flow meters downstream on each of the lines.
 
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