| 摘要 |
The invention concerns a method and an installation for filtering a liquid using a membrane filtering device. The invention concerns the technical field of making filtering devices, in particular semi-permeable devices. The invention is characterised in that a liquid pressurising pump (3, 4) comprises three pistons (24, 25, 26) connected to a common shaft and mounted mobile in translation in three aligned chambers (18a, 18b, 19a, 19b, 20a, 20b); two of said pistons (24, 26) are identical, and are coupled to the shaft (23) ends and divide a chamber (18, 20) into two cavities (18a, 18b, 20a, 20b).
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