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"Select the Valves & Filling category to introduce valves in your pipes. Drag the desired valve on the pipe and release the mouse click when the green square appears. This indicates that the valve has been fitted into the pipeline. From the Instruments category, insert the shapes in your diagram near the valves, pipelines, or any equipment they are associated with. Resize and reposition the shapes to adjust to your diagram."
<https://www.edrawsoft.com/article/how-to-make-pid-in-visio.html>