Valve for reverse osmosis purification and storage system

Claim 1

In a water purification system in which purified water from a reverse osmosis module is stored in a container at relatively low pressure and, when a dispensing valve connected to said container is opened, impure water is introduced into said container to pressurize said purified water therein for delivery to said dispensing valve, the improvement which comprises; a unitary valve for controlling the release of blowdown from said reverse osmosis module, for controlling the normal low pressure in said container, and for controlling introduction of impure water into said container, said unitary valve comprising: a. a body; b. a flexible diaphragm dividing a first cavity in said body into a pair of chambers, said diaphragm being sealed to the sidewalls of said cavity; c. a connector, for connection with the system supplying purified water to said dispensing valve, communicating with one of said chambers in said first cavity in said body; d. a connector, for blowdown disposal from said reverse osmosis module, communicating with the other of said chambers in said first cavity in said body; e. a plunger actuated by said flexible diaphragm, the bottom of said plunger mating with a port in a second cavity in said body; f. a connector, for connection with an impure water supply, communicating with said port in said second cavity in said body; and, g. a connector, for connection with said container, communicating with the said second cavity in said body and communicating thereby with said connection for blowdown disposal through a restricted passageway associated with said plunger and leading to said first cavity in said body.