SYSTEME DE REGULATION DE PRESSION DANS UN CIRCUIT DE CIRCULATION DE FLUIDE A DEBIT DETERMINE, ET CHROMATOGRAPHE UTILISANT CE SYSTEME.

摘要

The invention concerns a system for regulating the pressure (PA) at a given point (A) of a fluid circulation device operating in open circuit and at a given flow rate. According to the invention, the regulating system comprises a chamber (10) arranged downstream of the given point (A) and having an inlet (11) and outlet (12) aperture for said fluid opening into the chamber (10) substantially perpendicularly to a wall (20) which can move in translation under the action of moving means (30, 31 - 60, 61) controlled by a comparator (40) making a comparison between said pressure (PA), measured by a detector (50) and a reference value (PO). Application to supercritical-phase chromatography.