Liquid purification or separation – Flow – fluid pressure or material level – responsive – Check valve
Patent
1998-07-31
2000-05-30
Drodge, Joseph W.
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Check valve
2102572, 2104161, 417295, 417313, 417404, 417536, B01D 6110, F04B 3500, F04B 702
Patent
active
060687649
ABSTRACT:
In one embodiment a reverse osmosis permeate pump with shut off valve and reverse osmosis system employs bypassed feed water from the reverse osmosis membrane to drive a water wheel and gear set to reciprocate a piston back and forth between two chambers in the pump. Permeate from the membrane is introduced to the respective chambers by a pair of fluid inlets and discharged from the respective chambers through a pair of discharges to a storage tank. Flow through these respective inlets and discharges is a function of the direction in which the piston is moving and whether it is imparting a pressure or suction on a given chamber. A second piston is exposed to the pressure in the discharges from the chambers and the second piston moves between a position permitting incoming feed flow to the membrane, and a position blocking that flow upon increase in pressure in the fluid discharge from the chambers. In another embodiment, the reverse osmosis permeate pump is powered by an independent source of power. In both embodiments, the pump and shut off valve is on the permeate side of the membrane which permits a substantial reduction in pump size, and the permeate pumps and shut off valves of the invention permit substantially increased pressure drops across the membrane and increased system production capacities and rates.
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patent: 5503736 (1996-04-01), Shoenmeyr
Welcome Watertec Enterprise Inc., Internet printout, 10 pages, undated.
"Owners Manual, Undersink Reverse Osmosis Drinking Water System", Ecowater Systems, St. Paul, MN, pp. 1-17 & 20, Mar. 1996.
"Finally, an RO System That Does What It's Supposed to Do. And More"; Water Technology, pp. 53 and 54, Nov. 1996.
"Permeate Pump Installation Instructions"; Aguatec, Irvine, CA, 2 pages, undated.
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