| 摘要 |
<p>The invention relates to a pump comprising two end chambers (2, 3) which house pistons (4, 5) that pump seawater to a reverse osmosis membrane (7) and a central chamber (8) which houses a slide part that is actuated by the movement of the pistons (4 and 5), thereby controlling a directional valve (9). Said pump can be used to reverse alternatively the entry of the external pressure toward the rear zones of the end chambers (2, 3) and the entry of the pressure of the water driven back by the membrane toward the rear zones of said chambers (2, 3).</p> |
