Tubeless tire valve

Claim 1

A valve mounted in a tubeless tire rim comprising: a tubeless tire rim having a hole therein; a valve body having an enlarged head at one end having an external diameter larger than the diameter of the hole in the rim, wherein said valve body defines a circumferential seat, said valve body further having a longitudinal passageway formed therein; a valve means for opening and closing the passageway in the valve body; a preformed external gasket inserted on the valve body, said external gasket having an intermediate zone having an external diameter which is larger than that of the hole in the rim, said external gasket having a through hole for receiving the valve body, said through hole of the external gasket comprising a first portion and a second portion, the first portion having an internal diameter which is smaller than the internal diameter of the second portion; said valve body seat having a circumferential impression at a position axially corresponding to the position of the rim with respect to the valve body; the internal diameter of the first portion of the through hole, when the external gasket is in a preassembled condition with respect to the valve body, is smaller than the external diameter of the valve body portion upon which it will be inserted, while said internal diameter of said second portion of the through hole is larger than the external diameter of the circumferential impression portion of the valve body seat portion at a position corresponding to the position of the rim with respect to the valve.