Backflow preventer
barkinmarm
3 years ago
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Comments (6)
formulaross20
3 years agoStax
3 years agoRelated Discussions
Backflow preventer
Comments (8)I have a situation very similar to Toffee1's. I want to add an additional drip line to the balcony from the existing irrigation system. The existing system has a shut off valve connected to the water supply. After the shut off valve is a pressure vacuum breaker (Wilkins model 720A) which then connects to 3 control valves (one for the lawn, one for trees, and one for shrubs). I simply made a new branch from the 1/2" black ploy tube off the shrub line to the foot of the house (about 10 ft). Then I plugged in 3 micro-tubes (1/4") into the poly tube and pulled them up to the balcony. Water pressure is good enough when it reaches the balcony. However now I just realized I will have about 10 drippers on the balcony. These drippers are located much higher than the Pressure Vacuum Breaker. I wonder how likely this is going to cause the PVB to malfunction. If I add an inline backflow preventer (you can buy it from Home Depot for just a few dollars) on the new poly tube will it solve the problem? I am looking forward to hearing from you experts :)...See MoreWell Pressure Tank......need a backflow preventer?
Comments (3)If the system worked until the tank failed, the requisite check valve or foot valve is already in place. Jet pumps will not work without the foot valve and submersible pumps have a check valve built-in....See MoreWhere does the backflow preventer go?
Comments (6)These things: http://www.homedepot.com/Plumbing-Plumbing-Parts-Repair-Sink-Parts-Repair-Vacuum-Breaker/h_d1/N-5yc1vZbqmx/R-100023435/h_d2/ProductDisplay?catalogId=10053&langId=-1&storeId=10051 The body of the valve can be drained if needed. It needs to go between the supply line and the ON/OFF valves ... in AZ, code requires either one in the supply line before the manifold, or one to each valve in the manifold. The important part is they have to be the highest part in the system, so they can work properly....See MoreIt this a backflow preventer?
Comments (5)Ask the local authority what they require. I had a standard backflow preventer that came with the house, and, when it was time for the required annual check, the inspector noticed that it was not quite the right one for our installation, and I had to replace it with an almost identical one that had one differently designed orifice. I installed my own. I bought the correct valve online for about $125 (the same thing was $300 at the local supply house). I cut into the piping, added unions to the valve (for easy maintenance removal), and resoldered the piping; this added about another $60 in materials. It would probably take a plumber an hour to do if access is easy. I'm guessing you are looking at $500-1000, parts and labor, depending on where you live. Expansion tanks are cheap (maybe $30), but there will be more repiping for that, too....See Morebarkinmarm
3 years agoStax
3 years agobarkinmarm
3 years ago
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