Valve, in particular for ultra high purity gas containers

摘要

The valve has a holding ring (70) surrounding an annular seal (64) in a circumferential manner and comprising a radial lip (72) supported on an outer edge of a front end face of the seal. The seal has an outer annular shoulder on the edge of the front end face of the seal. The radial lip of the holding ring has an annular bead (76) facing the shoulder of the seal. The ring is fixed to an open/close element (32) by a leaktight outer circumferential weld (77), so that the bead passes axially into the shoulder of the seal to compress it.