Patent ID: 8424554

Claim:
A control valve for a reverse osmosis water purification system, comprising: a multi-part valve housing having first and second ends; a pure water chamber disposed at the first end of the valve housing, wherein the pure water chamber has a pure water inflow port, a pure water outflow port and a pure water valve head slidably disposed therein; a brine water chamber disposed at the second end of the valve housing, wherein the brine water chamber has a brine water inflow port, a brine water outflow port and a brine water valve head slidably disposed therein, and is coupled to a feed water source; a central cavity disposed between the pure water chamber and the brine water chamber, the central cavity being exposed to atmospheric pressure and hermetically sealed from the pure water chamber by a first resilient diaphragm and from the brine water chamber by a second resilient diaphragm; and a frame disposed in the central cavity and operatively connected to the pure water valve head through the first resilient diaphragm and the brine water valve head through the second resilient diaphragm, wherein the frame, pure water valve head and brine water valve head are slidable as a single structure within the valve housing between an open position and a closed position.