How To Drain A Backflow Preventer When Winterizing Sprinklers - Landscaping & Lawn Care - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Landscaping & Lawn Care


Thread Tools Display Modes
Old 10-05-2009, 11:30 AM   #1
Just call me Andrew
Join Date: Mar 2009
Location: Albany, NY
Posts: 2,261
Rewards Points: 1,018

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?



secutanudu is offline   Reply With Quote
Old 10-05-2009, 09:57 PM   #2
Join Date: Sep 2009
Location: BC, Canada
Posts: 250
Rewards Points: 152

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


burnt03 is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Backflow Preventer - M2 or M3? velcrobots HVAC 6 10-04-2009 12:20 PM
Furnace leak while running AC unit lbartowski HVAC 3 09-18-2009 01:46 PM
Condensor drain Captflx HVAC 6 08-17-2008 10:19 AM
Wierd Floor Drain "Backup" rawkintrevo Plumbing 9 06-04-2008 07:10 PM
The Bioswale, french drain, deck, drainage dilemma (long) seabright_sc Building & Construction 2 01-05-2008 03:37 PM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1