Tight coupling device for two rigid, fixed pipes

A device for the tight coupling of two rigid, fixed pipes, whereof the axes can suffer from alignment deficiencies, wherein it comprises two first flanges integral with the ends of said pipes, each of these flanges having an end surface and a bearing surface oriented in opposite directions with respect to said end surface;

• two coaxial tubular parts, one cylindrical end of a first of these parts being slidingly received in a threaded end of the second part, each of these parts having at its opposite end a second flange having an end surface which can be positioned facing the end surface of one of the first flanges, one of the end surfaces facing the first and second flanges being a spherical surface and the other surface being planar;
• two first O-rings placed between the facing end surfaces of the first and second flanges;
• retaining nuts for the O-rings screwed onto two threads respectively formed on said parts, in the vicinity of the second flange, each nut having a bearing surface able to come into contact with the bearing surface of the first flange;
• a tight coupling nut between said parts and screwed onto the threaded end of the second part;
• and a third O-ring, placed around the cylindrical end of the first part, between two facing conical surfaces respectively formed at the end of the second part and on the coupling nut, the distance between said conical surfaces increasing radially inwards.