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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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