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I am in the process of designing my irrigation system, and I saw many people install the backflow preventer (reduced pressure zone device) first and then connect to an automatic master valve.

However, I'm debating whether I should move the automatic master valve before the backflow preventer as RPZD is very expensive, and my theory is if I give it less pressure, it will be last longer.

What do you think? Thanks!

  • why do you need an automatic master valve? – jsotola Jun 5 at 21:07
  • Location of backflow preventers in relationship to valves could be dictated by code. Make sure you understand the requirements before you start to make changes. – JPhi1618 Jun 6 at 15:46

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