Patent ID: 7550084
Filing Date: 2009-06-23
Classification: B01D,C02F

Abstract:
1. A reverse osmosis liquid filtering assembly comprising: a faucet a reverse osmosis membrane including an inlet for receiving intake liquid, a permeate outlet port for dispensing permeate liquid, and a concentrate outlet port for dispensing concentrate liquid; a permeate tube connecting the permeate outlet port to the faucet; a first valve controlling flow through the permeate tube; a concentrate tube having a first end connected to the concentrate outlet port and a second end for connection to a drain; a second valve controlling flow through the concentrate tube; a tank having a first chamber for storing the permeate liquid and a second chamber for receiving the concentrate liquid, the first and second chambers being operatively connected so that the concentrate liquid in the second chamber pressurizes the permeate liquid in the first chamber; a permeate diverter tube connecting the first chamber of the tank to the permeate tube between the permeate outlet port and the first valve; a concentrate diverter tube connecting the second chamber of the tank to the concentrate tube between the second valve and the second end of the concentrate tube; wherein the second valve opens and directs the concentrate liquid into the second chamber only when the first valve is opened to dispense permeate liquid from the faucet; and a flow restrictor located in the concentrate tube between the concentrate diverter tube and the second end of the concentrate tube such that flow resistance to the second chamber is less than flow resistance to the drain, so that concentrate liquid is first diverted to the first chamber, and flow resistance to the drain is less than flow resistance into the first chamber of the tank so that the flow of the permeate liquid into the first chamber can force the concentrate liquid out of the second chamber to the drain.