Discharge and purging device, a connecting endpiece and connector comprising such a device

Abstract

The invention relates to a discharge and purging device () adapted for limiting the pressure of a fluid (F) occupying the inner volume of a connecting endpiece (). The device () comprises a valve or a valve actuation piston; an inner enclosure () opening out on a front face () of the valve or of the piston; and an obturator () moveable between a closed position (C) where it obturates the front face () at a first seal area (Z) defining a first seal section (S) towards the front face () and an open position where it no longer obturates the front face (). The device () also comprises a first chamber () defined when the obturator () is in a closed position, between the enclosure (), the obturator (), the first seal area (Z) and a second seal area (Z) defining a second seal section (S) opposite to the front face () relatively to the first seal area (Z); a communication passage () between the first chamber () and the inner volume of the endpiece (); means () for returning the obturator into the closed position; and a second chamber () defined between the enclosure (), the second seal area (Z) and the obturator (), and isolated from the inner volume of the endpiece () and from the first chamber (). The first seal section (S) is smaller than the second seal section (S).