Patent ID: 6764595
Filing Date: 2004-07-20
Classification: B01D,C02F,Y10T

Abstract:
A reverse osmosis system comprising:a) a reverse osmosis unit having a source water input communicating with a source pressure, a permeate output and a concentrate output; b) a storage tank for storing permeate discharged by said reverse osmosis unit, comprising: i) a tank housing; ii) an elastomeric bladder contained with said housing and; iii) structure defining a pressurizing region between an outside of said bladder and an inside of said tank housing; c) a control valve assembly, comprising: i) a pilot valve responsive to the opening and closing of a permeate dispensing device through which permeate stored in said bladder is dispensed; ii) said pilot valve including a flow control element movable between a first and second positions; iii) said control element moving to said first position when permeate is not being dispensed by said dispensing device and moving to said second position when permeate is being dispensed by said dispensing device; iv) a servo valve responsive to the positions of said pilot valve control element, such that when said pilot valve element is in its first position a flow control member within said servo valve moves to a first position at which said pressurizing region in said tank is communicated with a drain; v) said servo valve flow control member moving to said second position in response to movement of said pilot valve element, wherein said pressurizing region of said tank is communicated with said source pressure, whereby contracting forces are applied to said bladder in order to drive permeate from said bladder of said tank and to said dispensing device.