Joint system between fittings and pipes

A press-fit joint system for tight connection between a pocket provided at an open end of a fitting or valve and an open end of a pipe in a hydraulic or pneumatic system, the press-fit joint system comprising:

• the fitting or valve, the pocket of said fitting or valve being configured to slidably accommodate the pipe to which it the pocket is to be connected and having an annular seat projecting outwardly that accommodates a compressible ring seal, wherein the connection of the pocket and the pipe is formed by imparting a plastic deformation to a pair formed by the pocket and the pipe, and at the same time compressing the ring seal so as to be pressed against surfaces of the pipe and the pocket, and
• the compressible ring seal, wherein said ring seal has one or more channels having an upstream opening and a downstream opening such as to allow a passage of fluid from an inside of the press-fit joint system to an outside prior to proper pressing between the pipe and the fitting or valve, and to occlude and to prevent the passage of fluid upon application of proper pressing between pipe and fitting or valve;
• said one or more channels having a curvilinear fluid path along the thickness of the ring seal between said upstream opening and said downstream opening.