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Old 10-05-2009, 11:30 AM   #1
Just call me Andrew
 
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How to drain a backflow preventer when winterizing sprinklers


I am preparing to do a winter blow-out for my sprinkler system. I had a plumber install a Watts 007 Double check valve assembly, it is located outside the house.

I have a blow-out/drain port downstream from the backflow preventer (outside), as well as before the DCVA (inside)

I have read that it is bad for the Doublecheck valve to blow air through it, and that the air compressor should be hooked up after it (so, outside in my case).

I have already cut off the water source to the sprinklers and drained the inside piping. After I do the blow-out, how do I go about draining the water from the 007 itself?

Thanks.

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Old 10-05-2009, 09:57 PM   #2
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How to drain a backflow preventer when winterizing sprinklers


I think they frown on blowing through the DCVA's because it's hard on the check valves. So, you could pop the top (4 1/2" bolts IIRC), remove the check valve assemblies and blow away

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