Liquid purification or separation – Flow – fluid pressure or material level – responsive – Discharge of treated material
Reexamination Certificate
2009-03-03
2011-12-27
Drodge, Joseph (Department: 1778)
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Discharge of treated material
C096S004000, C210S257100, C210S321600, C210S321650, C210S418000, C251S063000, C251S121000, C251S122000
Reexamination Certificate
active
08083936
ABSTRACT:
The production of purified water from a residential reverse osmosis drinking water system is limited by the pressure build up in the holding tank or reservoir. While the pressure in the tank increases the brine or waste water continues to flow at a constant rate. This condition makes an undesirable out of proportion relationship between the purified water and the waste water. The production of product water is controlled by the differential pressure across the purification membrane, as the tank pressure increases the differential pressure decreases and reduced production of product water results. The purpose of the device is to utilize the increasing tank pressure as a force to actuate the valve that proportions the waste water in a direct relationship with the product water. The ratio between the product water and the waste water remains constant during the period that purified water is being delivered to the holding tank.
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