| 摘要 |
A reverse osmosis water purifier system uses municipal line water pressure to separate pure water molecules from dissolved and undissolved matter. The system makes and stores product water in a sanitary enclosed pressure vessel in the absence of back pressure. A small water cell tank and a hydraulically powered control valve enable delivery at a fast flow rate near line pressure flow rate. The control valve is a combination sensing and multiple valving device that automatically turns on product water when it is called for by a user or an ice-maker. It automatically replaces water that is drawn, then turns itself off when its tank is full. It fast flushes the dirty side of its R.O. membrane while fast flow water is being drawn, and it slow flushes the same side of the membrane while the system is making product water. These alternating slow and fast flushes whisk away residue from a built-in brine restricter. All flushes sweep debris down the drain. The piston of the control valve moves reciprocally with and against water pressure. When moving against water pressure, additional power or bias is required to move the piston against line pressure. In lieu of a conventional mechanical bias, the novel piston levers hydraulic power by providing a trailing end of the piston with a larger surface area than its leading end, resulting in no mechanical bias drag and a greater range of operating pressure.
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