Reverse osmosis system and automatic cycling booster pump therefor
First Claim
1. In a reverse osmosis system including a reverse osmosis filter with a reverse osmosis membrane and having an inlet port connectable to a source of feed water under a predetermined pressure via a feed water inlet conduit, a product water outlet port for filtered product water, and a brine outlet port for brine, the improvement comprising:
- a pump coupled into the feed water inlet conduit between the source of feed water and the inlet port of the filter, said pump driven solely by including means the feed water under pressure for increasing the pressure of the feed water to a pressure greater than said predetermined pressure whereby the reverse osmosis filter receives feed water at increased pressure.
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Accused Products
Abstract
A reverse osmosis system including a reverse osmosis filter with a reverse osmosis membrane and having an inlet port coupled to a source of feed water under predetermined pressure via a feed water inlet conduit, a product water outlet port for filtered outlet product water, and a brine outlet port for brine. A pump coupled into the feed water inlet conduit between the source of feed water and the inlet port of the filter and driven by the feed water under pressure. The pump increases the pressure of the feed water so that the reverse osmosis filter receives feed water at an increased pressure.
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Citations
18 Claims
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1. In a reverse osmosis system including a reverse osmosis filter with a reverse osmosis membrane and having an inlet port connectable to a source of feed water under a predetermined pressure via a feed water inlet conduit, a product water outlet port for filtered product water, and a brine outlet port for brine, the improvement comprising:
a pump coupled into the feed water inlet conduit between the source of feed water and the inlet port of the filter, said pump driven solely by including means the feed water under pressure for increasing the pressure of the feed water to a pressure greater than said predetermined pressure whereby the reverse osmosis filter receives feed water at increased pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. In a reverse osmosis system including a reverse osmosis filter with a reverse osmosis membrane and having an inlet port connectable to a source of feed water under a predetermined pressure via a feed water inlet conduit, a product water outlet port for filtered product water, and a brine outlet port for brine, the improvement comprising:
a pump coupled into the feed water inlet conduit between the source of feed water and the inlet port of the filter, said pump including means driven on a pumping stroke by the feed water under pressure for increasing the pressure of the feed water to a pressure greater than said predetermined pressure whereby the reverse osmosis filter receives feed water at increased pressure and said system includes a brine valve for blocking flow of brine from the reverse osmosis filter to the pressure increasing means during the pumping stroke, said system constructed so that brine does not contribute to increasing the pressure of the feed water during the pumping stroke. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. In a reverse osmosis system including a reverse osmosis filter with a reverse osmosis membrane and having a pressurized water inlet port connectable to a source of feed water under a predetermined pressure via a feed water inlet conduit, a product water outlet port for filtered product water, and a brine outlet port for brine, the improvement comprising:
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a pump including a housing having a cavity, a feed water inlet port, a feed water outlet port and a reversing port coupled into the feed water inlet conduit between the source of feed water and the inlet port of the filter, a differential area piston reciprocable in said housing through pumping and return strokes and dividing the cavity of the housing into an inlet chamber communicating with the feedwater inlet port, an outlet chamber communicating with the outlet port and a reversing chamber communicating with the reversing port, said piston having a first relatively large area face in said inlet chamber, a second smaller area face in the outlet chamber and a reversing face in the reversing chamber whereby fluid in the inlet chamber can drive the piston on a pumping stroke and deliver fluid at increased pressure through the feed water outlet port to the inlet port of the reverse osmosis filter; a brine conduit extending between the brine outlet port and the reversing port; a brine valve in said conduit; and means driven by the piston for operating the brine valve.
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Specification