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I see dotted lines that are attached to pipes when I put in an isolation valve. What are they for? Can I turn them off?
The dotted lines associated with the isolation valve shows what pipe the isolation valve is attached to. It's there because isolation valves do not split pipes and if you accidently move you isolation valves around the only way you could visually tell what pipe it's associated with is by opening it the properties of the valve. In that respect the dotted line is very important.
If you'd like to turn off the dotted line there is a way to do that. Just double click in the element symbology on "Isolation Valve" and in the properties box that pops up set the property for "Show attached link decorations" to 'False'.
Note that the dashed line has no direct bearing on the spatial reference for the isolation valve itself. The isolation valve will be spatially located at the point where it is placed. For instance, if you place the isolation valve a quarter of the way down a pipe from the start node, the isolation valve will be assumed to be at that point. There is an attribute in the isolation valve properties called "Distance from End Point". This is the distance from the start node of the pipe to the location of the isolation valve.