Liquid purification or separation – Flow – fluid pressure or material level – responsive – Fluid current controlled cyclic system
Patent
1977-12-21
1980-02-26
Spear, Jr., Frank A.
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Fluid current controlled cyclic system
137544, 137562, 210110, 2102572, 210321R, 210433M, B01D 3100
Patent
active
041905377
ABSTRACT:
A reverse osmosis system employs a tank for storing permeate under a pressure which is a portion of the pressure of feed water introduced into a pressure resistant container housing a semipermeable membrane cartridge. Control means such as an automatic valve, preferably of the double diaphragm type, in the line introducing feed water into the pressure resistant container closes to shut off feed water flow when the pressure in the permeate storage tank reaches a first predetermined value, less than the feed water pressure, and re-opens to re-establish feed water flow at a second predetermined pressure lower than the first or shut-off pressure. A constricted passageway device such as a venturi in the pipe or connection between a dispensing device such as a faucet and the permeate storage tank has its throat communicating with the sensing conduit for actuating the feed water control valve. When the dispensing faucet is opened, flow of permeate through the venturi creates an amplified and drastically reduced pressure in the sensing conduit, and applies a servo or magnified actuation force to the valve in the re-open end of its control range.
REFERENCES:
patent: 3679055 (1972-07-01), Clark et al.
patent: 3794173 (1974-02-01), Bray
patent: 3831757 (1974-08-01), Gosset et al.
patent: 3887463 (1975-06-01), Bray
Bray Donald T.
Tondreau Raymond A.
Allen Clement H.
Desalination Systems Inc.
Spear, Jr. Frank A.
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