Seeing other “in the wild” flow meter installations was helpful to me in the planning stages so in the interest of sharing wanted to include my experiences. In my case there was not a clear shot of straight pipe, above ground, after the backflow valve and before the 90 elbow to the valve box.
Additionally, in reading some of the flow measurement research, it seemed that slightly longer straight pipe before and after the flow meter improved measurement accuracy. The consensus seemed to be 16" clear straight pipe before and 6" after. Since I needed to raise it either way, raised both sides of the back flow valve to create a 16" clear shot after the backflow valve and BEFORE the flow meter and 6" clear AFTER the flow meter and before the next 90 elbow.
The quality of the SharkBite fittings has been improving so used a combination of sweat and added sharkbite strategically to make replacing the flow meter or the backflow more plug and play in the future. Guess we will see how those SharkBite fittings hold up.
This is a bigger change so took about three hours to cut out the old sections and rebuild the new sections. There is definitely some cost involved whenever working with a copper installation.
As others have experienced during calibration, using a 2 minute run time seemed to be give each zone a better chance to stabilize, even with check valves on all of the individual spray bodies.
Looking forward to seeing how the additional GPM information improves both irrigation accuracy/efficiency and general system design/maintenance.