(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 7 of 7

Thread: Please help replacing my backflow preventer on my sprinkler system

  1. #1
    DIY Member mihomeowner's Avatar
    Join Date
    May 2013
    Location
    Michigan
    Posts
    39

    Default Please help replacing my backflow preventer on my sprinkler system

    My backflow preventer/pressure vacuum breaker cracked because I didn't get it to last fall before a early hard freeze. Stupid home owner mistake...

    Anyway, I'm trying to figure out to take one of these off and replace it, and I have seen some posts saying it's pretty easy... but I am not sure where to start. Do I need to take a hack saw to this thing to get it off? I see threads everywhere... but tried to take a wrench to them with no luck.

    Some of the threads have teflon tape on them, I would assume these should unscrew.

    Please help!! See attached pictures of my setup.
    Attached Images Attached Images      

  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
    Join Date
    Aug 2004
    Location
    Bothell, Washington
    Posts
    14,221
    Blog Entries
    1

    Default

    You will need to cut somewhere on that piping, and then couple and resolder.

    The vacuum breaker looks to be threaded into a shutoff on the vertical. That should unthread. If you need to replace the shutoff below it, you will either have to cut more pipe or chip out the brick to allow it to spin off.

  3. #3
    DIY Member mihomeowner's Avatar
    Join Date
    May 2013
    Location
    Michigan
    Posts
    39

    Default

    Quote Originally Posted by Terry View Post
    You will need to cut somewhere on that piping, and then couple and resolder.

    The vacuum breaker looks to be threaded into a shutoff on the vertical. That should unthread. If you need to replace the shutoff below it, you will either have to cut more pipe or chip out the brick to allow it to spin off.
    Thanks Terry. That is basically what I thought I was going to have to do. Cut one side, unscrew the other.

    Is this copper or galvanized steel? Coming in to the PVB it looks cooper but the downstream the piping is more black. Is this just what happens to old copper pipes? Weird how one side is black.

  4. #4
    Forum Admin, Expert Plumber Terry's Avatar
    Join Date
    Aug 2004
    Location
    Bothell, Washington
    Posts
    14,221
    Blog Entries
    1

    Default

    Copper can turn pretty black.
    You will need to sand that and flux it as you assemble the new fittings before soldering.
    You could use a union on the outlet side. It may help for replacement in the future, though odds are the next new one will be sized a little differently.

  5. #5
    DIY Member mihomeowner's Avatar
    Join Date
    May 2013
    Location
    Michigan
    Posts
    39

    Default

    Quote Originally Posted by Terry View Post
    Copper can turn pretty black.
    You will need to sand that and flux it as you assemble the new fittings before soldering.
    You could use a union on the outlet side. It may help for replacement in the future, though odds are the next new one will be sized a little differently.
    The only problem with using a union is, would it make it easier for someone to steal the thing? Thefts of these are on the rise, although mostly from businesses where I imagine the PVB is bigger.

    Anyway, if I don't do a union than a coupling would be the answer?

  6. #6
    Plumbing Contractor for 49 years johnjh2o1's Avatar
    Join Date
    Aug 2009
    Location
    South*East
    Posts
    1,121

    Default

    You will be replacing the valves as they a part of a new device.

    John

  7. #7
    DIY Member mihomeowner's Avatar
    Join Date
    May 2013
    Location
    Michigan
    Posts
    39

    Default

    Quote Originally Posted by johnjh2o1 View Post
    You will be replacing the valves as they a part of a new device.

    John
    John - Yes I noticed all the parts have the valves. It made me wonder why the valves are even threaded on to the PVB

Similar Threads

  1. Sprinkler Winterize, Backflow Preventer dilemma
    By mfmccoy in forum Irrigation / Sprinkler Forum
    Replies: 6
    Last Post: 10-31-2011, 02:17 PM
  2. Odd Backflow Preventer
    By Chris G in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 2
    Last Post: 05-23-2011, 06:25 AM
  3. Lawn Sprinkler: BackFlow Preventer, Take it in in Winter???
    By cn90 in forum Irrigation / Sprinkler Forum
    Replies: 2
    Last Post: 10-31-2009, 04:22 AM
  4. Leaking via Backflow Preventer
    By rschmitty in forum Water Heater Forum, Tanks
    Replies: 10
    Last Post: 05-20-2009, 01:06 PM
  5. Backflow Preventer
    By DAN T in forum HVAC Heating & Cooling
    Replies: 2
    Last Post: 09-28-2008, 08:54 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •