I purchased a house with a 15 to 20 year old system. It didn't get good coverage, the valves were basically buried in dirt, so I pretty much want to do it over. The good thing is that I already have a separate meter for it. To start I want the proper valves and backflow preventer for the front yard and will deal with the backyard later. I estimate that I'll need 5 or 6 zones in the front; and that I have somewhat low water pressure. My entire property is only 80ftx120ft, so not terribly large. The poly pipe that is being used is 1" wide, so I think that makes it 3/4" poly.
Currently I have a 3/4" copper that was converted to a 1" CPVC with a shutoff valve right before, which then goes outside into an old backflow preventer. (plastic, not metal) I can't tell what the 1" CPVC from the backflow preventer does because the valves are buried.
I was looking at this bronze backflow preventer:
800M4-QT
Seems messy though as I'd have to go from 1" CPVC to bronze, to CPVC and down to the valves. Are those conversions easy enough? Maybe even use a sharkbite connector as I think they can go from CPVC to male end to screw in to the preventer.
I guess my main question is, should I stick with the 1" backflow preventer? Should I get 3/4" or 1" valves? Or does it really matter what my PSI and GPM are? I'm getting a gauge next week, so I'd have numbers then. I'm thinking about having 1" CPVC coming out of the valves as "main" lines which then branch off when need to the heads with my current 3/4" poly tubing. (that i can reuse) Generally, how deep is the pipe burried in the yard? I was reading 8 inches was good. (I'm in Michigan, so we do get snow/ground freeze)
I thought I read that impact sprinkler heads work better with low PSI? Is this true?
Also, I wanted to try and make this, to make winterizing easier. The CPVC around the backflow seems to make this tougher though..
http://www.familyhandyman.com/DIY-Projects/Outdoor-Projects/Yard/Lawn-Care/how-to-winterize-a-sprinkler-system
Thanks, Nick
Does it really matter if you use 3/4" valves
This post has been edited 2 times, last edit by "the3dolla" (Jun 26th 2011, 1:26am)