With respect: Water in a pipe going straight up has pressure dependent only on the height of the column, not the amount of water in the column. If so a city water tank would have dramatic pressure from the big overhead tank. A 1/4" tube will have the same static head of pressure on it as a 6" pipe, assuming the same vertical change. Putting only one check valve into a well stem (at the bottom) does all the reverse flow needed. There is no change in head from a check. Multiple check valves would do nothing but restrict the flow. Jim
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Today's Featured Article - Museum Coverage: The Stuttgart Agricultural Museum - by Cindy Ladage. While cold wind was blowing back in Illinois, in Arkansas, daffodils were in bloom, and the Magnolia trees were adorned with fragrant blossoms. Stuttgart, Arkansas was the site of this year's winter Minneapolis Moline Collector's show February 25-27, 1999. The show was held at the Oliver Museum created by Don Oliver, the pioneer of the four wheel drive tractor. Oliver along with Gale Stroh and Kenneth Bull using Minneapolis Moline tractors and parts created what has become known as
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