Have 2" water lines for sprinklers, using 2" gate valves that
dont totally shut off water to the sprinkler heads.
Any suggestion on how to stop this condition .
I dont think Anti-Siphon valve are available in 2"
Water lines are run off a well.
Google 2" in-line check valves. The gate valves need protection from the well water which probable has debris that get stuck in the gate blade when it is closed. A filter before the gate valves would be good. I would use ball valves as a better option than gate valve in your situation. Watts has a 2" backflow preventer around $300. JMHO Aloha
Thx for the Tip
Ball Valve certainly worth a try