You are not logged in.

Reply

Dear visitor, welcome to SPRINKLER TALK FORUM - You Got Questions, We've Got Answers. If this is your first visit here, please read the Help. It explains how this page works. You must be registered before you can use all the page's features. Please use the registration form, to register here or read more information about the registration process. If you are already registered, please login here.

Attention: The last reply to this post was 5487 days ago. The thread may already be out of date. Please consider creating a new thread.

Message information
Message
Settings
Automatically converts internet addresses into links by adding [url] and [/url] around them.
Smiley code in your message such as :) is automatically displayed as image.
You can use BBCode to format your message, if this option is enabled.
Security measure

Please enter the letters that are shown in the picture below (without spaces, and upper or lower case can be used).

The last 2 posts

Thursday, April 23rd 2009, 9:10pm

by HooKooDooKu

Only one backflow preventer between the water source and the valves is all that is needed. And in your case, since the water source isn't a drinking water source, you might not need any backflow preventer.

The only time you have one backflow preventer per circuit is when you are using anit-siphon values.

However, this is one area where you MUST check with the city building inspector to determine what are backflow requirements in YOUR area, especially for connecting to a non-potable water source. Some cities have VERY strict ordanances that required very specific backflows (down to manufacture part numbers are specified) and require certified plumbers to install and annually test backflows. Others are extreamly generic, something along the lines of "appropriate backflow must be installed".

Thursday, April 23rd 2009, 5:18pm

by Van

BackFlow/CheckValve How many do I need?

I am installing an irrigation system at my home in FL. My plan is to install (1) backflow 1.25" just as it comes out of the canal (water Source). Then its 100' of pipe to the pump. Do I need seperate backflows for each zone? I will be using Hunter products throughout, and I think some of the higher end rotors have a self contained backflow as well? I can see the reason for the backflow as it comes out of the canal because there is a slight hill as it initially comes out of the canal(25' @ 45 degrees). Since my system will not be connected to house/drinking water, I don't see a need for more than 1 Backflow preventer. My system will have 22 heads and 4 zones pumping directly from a canal. Is 1 backflow enough? Thanks.