gahlen
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I replaced a broken irrigation valve today ( the kind that needs a t-handle to open/close ) it is 4.5 feet underground. The irrigation valve was replaced because it was stuck on. I noticed that after hooking everything back up that when I open the valve to allow water to thru the sprinker system all is as it should be. The question comes because when I close the valve, a large volume of water drains back thru the drain hole in the irrigation valve. I thought that the double backflow valves prevent back flow/siphon? Do they only operate under pressure? How can I check them and ensure that they are operating correctly?
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