Reverse osmosis water purification system for producing carbonated water

摘要

A reverse osmosis water purification system produces product water in response to pressurized feed water from a water supply line. The unit also produces waste or drain water. The purified product water is supplied to a reservoir wherein the pressure of the water increases when the reservoir becomes filled or when waste water is used to pressurized the product water and enable it to be withdrawn at a tap or faucet. The product water is carbonated within the product water reservoir with pressurized carbon dioxide gas supplied to the reservoir at a pressure sufficient for the gas to dissolve in the product water via a valve responsive to the pressure of the product water in the reservoir which is normally closed and opens only when the product water is under pressure sufficient to dissolve the gas; this pressure occurring when the reservoir is full in accordance with one embodiment of the invention or when the reservoir pressure is increased when a regulating valve supplies pressurized waste water from the reverse osmosis unit to the reservoir to pressurize the product water therein, in accordance with another embodiment of the invention.