Pressure and Plumbing Fixtures

And when your customer says, what standard did you "design" this fixture to, will you say, "I got it from total strangers on an internet site"?

If I were you, I'd be asking for a source of the standards, and then I'd purchase them. Then read them. Then you can "design" fixtures without waiting for an answer from strangers.

Good luck.

It is unwise to publish your e-mail adderss in public forums.

For minimum pressure see your local plumbing code. The maximum pressure that I used years ago was 80 psig (5.5 barg) at the inlet to th eplumbing line into any building per UPC.

If the preesure is above 80 psig, install PRVs.