backflow preventer for uphill zone
I have one uphill zone on a rather steep 40' slope. I understand I can use a reduced pressure principle (RPP) assembly, and I can afford the 15 psi pressure loss, but I'm concerned about the cost, complexity, and testing requirements.
I'm considering using one PVB for all the downhill zones and using an AVB on the top of the hill for the uphill zone. I know AVB's are frowned upon, but I know a lot of people (in Southern California at least) use anti-siphon valves which are really just a valve with an integral AVB. Is an AVB really any worse than an anti-siphon valve? I suppose I could use an anti-siphon valve, but I really don't want the wires exposed on the hill and I don't want to run a pressurized mainline up the hill either.
Are there any other options for dealing with an uphill zone?