asked 4 October 2017 asked by Robert_D (19700 points)
If you want to know how far to space it from a valve, or 90, ask the manufacturer. Assuming they are gone, leave at least 3 of it's own lengths before the meter, and 1 1/2 after it. Good Luck.
I would even leave 5 before and 3 after
8 x diameter.