Bypass valve closing means

Details Bypass valve closing means Bypass valve closing means

E - Fixed Constructions

21

B

E21B 21/10 (2006.01) E21B 34/06 (2006.01) E21B 34/10 (2006.01)

Patent

CA 2295592

This invention relates particularly but not exclusively to the secondary means for closing a bypass valve. A bypass valve (102) is provided which comprises a body (4) having a bore extending therethrough; at least one aperture (32) adapted to allow fluid communication between the bore and a chamber defined in the body (4); and at least one aperture adapted to allow fluid communication between the chamber and the exterior of the bypass valve. Fluid communication between the chamber and the bypass valve exterior is permitted when a piston (78) located in the chamber is in a first position, but is not permitted when the piston (78) is in a second position. Means for selectively exposing the piston (78) to a pressure differential which moves the piston (78) is provided. A bypass valve is thereby provided which is more reliable than conventional bypass valve equipment.

L'invention concerne en particulier mais non exclusivement des moyens secondaires pour fermer une soupape de dérivation. Cette soupape (102) de dérivation comprend un corps (4) traversé par un conduit; au moins une ouverture (32) est aménagée de manière à permettre une communication fluidique entre le conduit et la chambre formée dans le corps (4); et au moins une ouverture est aménagée de manière à permettre une communication fluidique entre la chambre et l'extérieur de la soupape de dérivation. La communication fluidique entre la chambre et l'extérieur de la soupape de dérivation est possible lorsqu'un piston (78) placé dans la chambre se trouve dans une première position, mais n'est pas possible lorsque le piston (78) se trouve dans une seconde position. L'invention porte également sur des moyens pour soumettre sélectivement le piston (78) à un différentiel de pression entraînant le déplacement du piston. On obtient ainsi une soupape de dérivation plus fiable que les modèles de soupapes conventionnels.

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