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Old 04-25-2010, 11:05 AM   #16
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Unsafe irrigation systems....? Why bother?

The double check backflow assembly is not only better because it can be tested, ...
This is from a manufacturer:


In-Line Testable/Serviceable Dual Check Valves

3/4 and 1 in. (20 and 25mm)

Series L7 In-Line Testable/Serviceable Dual Check Valves prevent the reverse flow of polluted water from entering into the drinking water supply at the service entrance or at individual outlets. It consists of a bronze body construction, with two plastic check valves with top-mounted covers, silicone discs, stainless steel springs, and three test ports for easy in-line service. Series L7 is designed for non-health hazard residential water system containment, continuous pressure applications and is installed immediately downstream of the residential water meter. Check with local inspection authorities for installation requirements. Minimum Working Pressure: 10psi (69 kPa) Maximum Working Pressure: 175psi (12.06 bar).

I could be mistaken, but I believe that Watts is a major manufacturer of these products, and if they say that this DUAL valve can be tested, I will take their word!

It didn't take me long to find this from the mfg's site, and I'm just a barefoot, ignorant, Gawja redneck.

If it's worth doing, it's worth doing right. If you wouldn't put your name on it, it ain't done right!
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Old 08-16-2010, 08:31 AM   #17
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Unsafe irrigation systems....? Why bother?

You can manually connect a hose (as the only feed) to a sprinkler system cut off from the problemmatical check valves as opposed to do all your lawn watering with new portable sprinklers.
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Old 08-24-2010, 03:14 PM   #18
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Unsafe irrigation systems....? Why bother?

I am wrestling with an owner installed system also. I have found the book put out by Scotts to be very helpful in the basics and the more advanced principals of irrigation and as i recall it specifically addresses your concern. Good luck - and don't give up. The company is more than likely using the "fear" motivation to encourage you to use their services. It is all pretty basic stuff though. Call your library and see if they have Sprinklers & Watering Systems - by Meridth books - Des Moines, Iowa

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