Would the line attributes be any different on its outlet? If not, then yes, the program will acquire any attributes or properties that are within the line it is connected to if you set up a simple acquisition property within the PSV class. The largest caveat here however is that if you have more than one unique lines connected to the PSV that have differing properties, the PSV will not be able to decide which value should be acquired (ie: line size), and a "?" will appear. So for instance if you want to define an inlet size and and outlet size, you can't because the program does not allow you to define what is the inlet or the outlet of the PSV. At this point (P&ID 2014), you can only pull in a value from a single process line, and you won't know whether inlet or outlet, it will just be the nominal value (size for instance).
We have this problem with sanitary zero-static valves (similar to 3 ways valves) that are connected to 2 lines (header line + branch line). We have to isolate the valve from the branch line with a special symbol in order to not confuse the size, spec, service of the header info that we want to show up in our valve lists.
I hope this offers some clarity into what you are looking for...
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