Patent ID: 7007954

Claim:
An annular gasket for a fluid transfer coupling between a feed pipe endpiece and a connection tube, the coupling including an annular groove for receiving the gasket, which gasket presents a bearing face for bearing against the bottom of the groove and a bearing face for bearing against the endpiece, the groove presenting an opening and a groove bottom that is substantially flat and smaller in size than the opening, the gasket presenting in section a bearing face for bearing against the bottom of the groove that is smaller than its bearing face for bearing against the endpiece, the widths of the bottom and endpiece bearing faces being determined respectively as a function of the dimensions of the bottom and of the opening of the groove, the gasket being of the four-lobe type presenting an X-shaped section with an envelope that is substantially trapezoidal with two groove-bottom lobes forming the bearing face for bearing against the bottom of the groove and corresponding to the small base of the trapezoid, and with two contact lobes forming the bearing face for bearing against the endpiece and corresponding to the large base, in which the ratio of radial height between the bases of the trapezoid and between the bottoms of the lobes is determined by the dimensions of the groove so as to provide a coupling in which the gasket is not flattened other than by deforming the lobes and in which the ratio of the radial heights lies in the range 60% to 70%.