SPRINKLER TALK FORUM - You Got Questions, We've Got Answers

Sorry for the late response-
I do not think there is a minimum height difference for auto drain valves. One other thing I forgot to mention- On systems with master valves, or ran by pump, we install a drain valve on every manifold so they drain out every time. We then intstall a boiler drain before the master valve, but after the main valve, so we can drain that part. Then, we put autos on the end of the laterals and mains, and also where a low spot is where water may collect. This eliminates blow-out of the system, but you still have to do a little winterization:

1. Shut off main line and drain the line between the main valve and master valve

2. Turn controller to "OFF" mode, or unplug it and remove battery-which ever one the users manual says to do.

Hi, RVLI

I'm working for a system in my yard, which has a 3-feet difference between highest and lowest in a zone. Questions:

1. What is the min height differece for auto drain valves?

2. Can I eliminate winterization if I install valves in all zones?

I just don't use them because they are a hassle to install. When I do install them, I put them on the bottom of a line thats on a hill, but I rarely install on hills becasue my area is pretty much flat. Hope this helps!

rvli- you said you rarely use auto drain valves. Is their some problem with them that causes you to avoid them or do you just live where you don't need them?

I rarely use auto drain valves, but if I do, I use the plastic RainBird Drain Valves. I have never used brass before, so I could not tell you what brass is like. Hope this helps!

WHICH KIND OF AUTO DRAIN VALVES ARE MORE RELIABLE BETWEEN PLASTIC AND BRASS. WHAT KIND OF LIFE EXPECTANCY CAN BE EXPECTED FROM THEM.