Abstract: A filter cartridge assembly intended for replaceable installation in a demountable cartridge housing includes in one embodiment, a retaining ring that is attached to the product water tube of the filter cartridge, is inserted with the cartridge into the housing, and is locked to the housing such that, upon subsequent removal of the housing to change the cartridge, the cartridge will be forced from sealing engagement with the end cap header and caused to remain in the housing until the housing has been removed. The integral retaining ring and cartridge are then simply unlocked and removed from the housing for replacement. Brine ring embodiments that are welded to the housing or attached to the housing with a snap-in connection are also disclosed.

Abstract: A filter cartridge assembly intended for replaceable installation in a demountable cartridge housing includes in one embodiment, a retaining ring that is attached to the product water tube of the filter cartridge, is inserted with the cartridge into the housing, and is locked to the housing such that, upon subsequent removal of the housing to change the cartridge, the cartridge will be forced from sealing engagement with the end cap header and caused to remain in the housing until the housing has been removed. The integral retaining ring and cartridge are then simply unlocked and removed from the housing for replacement. Brine ring embodiments that are welded to the housing or attached to the housing with a snap-in connection are also disclosed.

Abstract: A unitary multi-function control module 18 for a reverse osmosis water purification system provides all of the necessary flow control functions in a single removable and easily replaceable unit. The module connects directly with a unitary injection molded manifold 14 and includes a control housing having a cover plate 42, a main body 40, and a closure plate 47. The control housing entirely encloses therein the supply flow shutoff valve 46, the reverse osmosis flow control 100, the permeate back flow check valve 82, and all of the interconnections between the manifold and the supply, permeate, and brine flow paths.

Abstract: A retaining ring assembly for a reverse osmosis filter cartridge includes a removable retaining ring inserted into the cartridge housing after insertion of the cartridge, the retaining ring including a demountable locking connection with the housing. When the housing is subsequently removed to replace the cartridge, the retaining ring forces the cartridge from its tightly sealed connection to the end cap or header, allowing the cartridge to be easily removed with the housing. Preferably, the housing includes a special brine ring adapted to cooperate with a conventional cartridge brine seal, the brine ring providing connection for the retaining ring and defining with the housing a brine flow passage.