Importance

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Abstract

This disclosure relates to a reverse osmosis apparatus comprising a reciprocating pump or pumps including a first cylinder chamber and a second cylinder chamber which is smaller in volume than the first chamber due to a piston rod extending through the second cylinder chamber, a feed conduit connected to the first cylinder chamber for feeding fluid thereto through a first one-way flow piping for fluid flow thereto, a reverse osmosis membrane module including an inlet and an outlet which collects permeate fluid, a second one-way flow piping connecting the first cylinder chamber with the reverse osmosis membrane module inlet for fluid flow to the inlet, a selector connecting the second cylinder chamber with the reverse osmosis membrane module outlet, and a drain conduit connected to the selector for draining concentrated fluid from the second cylinder chamber. The selector has a first position allowing the reverse osmosis membrane module outlet and the second cylinder chamber to communicate together and isolating the drain conduit. The selector also has a second position blocking the outlet allowing the second cylinder chamber and the drain conduit to communicate together. The selector is connected in pressure communication with the cylinder chambers to shift to the first position when the pressure in the first cylinder chamber increases, and to the second position when the pressure in the second cylinder chamber increases.

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First Claim