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View Full Version : RainBird ASVF Valve - Back Pressure Issue


mikes166
01-05-2013, 07:14 PM
Hello - I just revamped my entire irrigation system to move the valve manifold and controller into a new shed I built. I have installed 7 new Rainbird 1" DAS-100 ASVF valves in the system, and have been testing them manually prior to connecting a controller. The valves work fine in terms of opening and closing, and water flow. However, several of them, when manually turned off (using the solenoid bleed control), have water flowing out of them onto the floor of the shed. Others do not exhibit this issue. I'm thinking that this may be due to back pressure from the lines. The valves are installed roughly 2 feet above grade, which seems well above the rotors and sprinklers. I can certainly extend the valves higher, but before I make that change I'd like to know if anyone can confirm that valve height is indeed the likely issue. Any suggestions and/or feedback on the cause of the water being pushed out of the valves after they have been closed would be greatly appreciated. :confused: