Gasket for a valve of an internal combustion engine

Gasket for a valve of an internal combustion engine;

• said valve comprising a guide element defining a through seat, and a stem movable in a sliding manner in said seat;
• said gasket having a central axis and comprising:
• an elastically deformable sealing element, having an annular shape with respect to said axis and adapted to be arranged externally on said valve to cooperate both with said guide element and with said stem;
• and
• a support member having an annular shape with respect to said axis, arranged coaxially on at least part of said sealing element so that the latter is pressed radially between said support member and said valve;
• wherein said sealing element is delimited by a radially external surface, cooperating with contact at least in part with said support member, and by a radially internal surface having a first portion, configured to cooperate with contact in use with said stem so as to define with the stem itself a dynamic type seal, and a second portion, configured to be pressed in use radially by said support member against said guide element so as to define a static type seal with the guide element itself;
• wherein said second portion has a circumferential surface section and a plurality of discrete bumps, projecting cantilevered from said circumferential surface section to cooperate with contact in use with said guide element, angularly spaced from each other around said axis, annularly aligned with each other at a predetermined axial position along the axis itself and forming a discontinuous undulation of the radially internal surface.