Have been sent to high rise buildings in LA a few times. I always marvel at some of the pipe sizes I see, these PRV stations are pretty cool as well The brand that makes them is Claval. I'm curious if any is you have experience with these devices? I leaned what I can but they make a bunch of different styles of valve. The large lines are cold and hot mains with smaller bypasses, I assuming that each line has multiple valves for redundancy? Pretty interesting stuff, thought you may find it interesting.