I have an issue in EPA-net software. In my research project, I need to use a non-return valve (one way valve) to complete hydraulic modeling. I don't know which type of valve in EPA-net software is relevant for my requirement.
This type of valve has to be implemented in the pipe itself. Then, just open the pipe properties dialog", go to "initial state" and select "non-return valve" (or "CV", may be). I do not have the English release of Epanet but the Spanish and the Portuguese but it should be done that way.
Do not hesitate to ask if you find any further problem.