On a sureflow or any diaphragm pump you will do best if you have a recirculation line from the line at the pump outlet to just before the lines bringing sap to the pump. that line then should have a needle valve or even a conventional ball valve to regulate the flow, it only needs to get a little to keep the diaphragm and internal check valves wet.
To answer the question of how much it helps, if you keep the system tight (no leaks) you can get 2-3x as much sap. However, diaphragm pumps don't do well fighting leaks, even micro leaks.
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Dave Klish, I recently bought a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.
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Originally Posted by maple flats
