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Firstly, thanks Patrick for jumping in to help explain PSV valve behavior. I couldn't have done a better job myself.
I believe this Idea can be closed. Customers are always welcome to reach out to support for questions and guidance.
You can already do this by using a pressure sustain valve set at the pressure you desire. The valve will not open until the pressure you specify is met then it will open. This is the easiest way to do what you are wanting to do with an existing model valve. The valve will be set to flow upstream to downstream directionally in this case in the model. The pressure sustain valve will not open unless its "sustain" pressure is met and why it also works well as a pressure relief valve. Once the pressure is met it fully opens but will only allow flow to keep the pressure no higher than the specified pressure noted. Normally a Pressure sustain valve is "restraining" a pipeline flow to maintain a minimum upstream pressure, but it can also be used in a model to model a pressure relief valve (often at a pump station) and works well to do so.