A regulated control valve assembly is provided for use in a water purification system having a reverse osmosis unit to produce relatively purified water from a feed water supply of ordinary tap water or the like. Purified water produced by the reverse osmosis unit is supplied to a purified water chamber...http://www.google.ca/patents/US4776952?utm_source=gb-gplus-sharePatent US4776952 - Regulated control valve assembly for a water purification system
