Gasket for a valve of an internal combustion engine

A gasket for a valve of an internal combustion engine is described. The valve has a guide element defining a through seat, and a stem movable in a sliding manner in said seat. The gasket has a central axis and comprises: a sealing element, having an annular configuration with respect to the axis and suitable to be arranged externally on the valve to cooperate both with the guide element and with the stem; a supporting member having an annular configuration, arranged coaxially on at least part of the sealing element so that the latter is pressed radially between the supporting member and the valve; an end flange projecting radially outwards from the supporting member and configured to receive the elastic load of a coil spring of the valve; and protruding means distinct from the flange, projecting outwards from the supporting member and suitable to cooperate with the spring of the valve to maintain it coaxial with the axis. 种用于内燃机(3)的气门(2)的衬垫(1)；气门包括限定通座的引导元件(7)和以滑动方式在通座内移动的气门杆(8)；衬垫(1)具有中心轴线(A)并包括：密封元件(12)，其相对