Differential valve for a sub-sea flexible pipe

F - Mech Eng,Light,Heat,Weapons – 16 – K

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Details

F16K 17/04 (2006.01) E21B 34/04 (2006.01) F16K 24/04 (2006.01)

Patent

CA 2290668

The invention concerns a differential relief valve for flexible sea line comprising: a valve body (1) including an upper part communicating externally through at least one upper communication passage (25) and a lower part communicating with at least one annular space of the flexible sea line through a communication conduit (7); an internal chamber (3) arranged in the valve body (1) and wherein prevails a chamber pressure (P c); a main check valve (10) mounted in said internal chamber (3) and capable of taking up a closing position and an opening position, said main check valve (10) being urged in closing position by a spring calibrated with a predetermined calibrating force. The invention is characterised in that it further comprises a secondary check valve (27) mounted in the upper communication passage (25) and capable of taking up a closing position and an opening position, said secondary check valve (27) being urged in closing position by a small calibrated spring (35), such that the internal chamber (3) pressure is not less than the external pressure (P e) for the closing position of said secondary check valve (27).

Elle est du type comprenant: un corps de soupape (1) comprenant une partie supérieure communiquant avec l'extérieur par au moins un passage de communication supérieur (25) et une partie inférieure communiquant avec au moins un annulaire de la conduite flexible par au moins un conduit de communication (7); une chambre interne (3) ménagée dans le corps de soupape (1) et dans laquelle règne une pression de chambre (Pc); un clapet principal (10) qui est monté dans ladite chambre interne (3) et qui est susceptible d'occuper une position de fermeture et une position d'ouverture, ledit clapet principal (10) étant sollicité vers la position de fermeture par un ressort qui est taré avec une force de tarage prédéterminée; caractérisée en ce qu'elle comprend en outre un clapet secondaire (27) monté dans le passage de communication supérieur (25) et susceptible d'occuper une position de fermeture et une position d'ouverture, ledit clapet secondaire (27) étant sollicité vers la position de fermeture par un petit ressort taré (35), de sorte que la pression de la chambre interne (3) ne soit pas inférieure à la pression extérieure (Pe) pour la position de fermeture dudit clapet secondaire (27).

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