Information about the helium valve of your watch
The helium valve is a safety valve especially designed for diving watches, which allows helium to escape from the case of the watch during decompression. Divers who work at great depths use diving bells or other pressure vessels. A high proportion of helium is added to these pressure vessels. The helium atoms are very small and penetrate the watch due to the overpressure through the seals. If the pressure vessel, for example a diving bell, is brought up again, the pressure in the pressure vessel is continuously adjusted to the level of the environment. The human tissue releases the helium in the ascending phase more quickly than it can escape from the water-tight diving watch. An enormous overpressure builds up inside the watch. In order to prevent the watch from being damaged because of the overpressure, the helium atoms which have penetrated must be released again. This is then done via the helium valve. The helium valve was patented by Rolex in 1967 and is now an indispensable prerequisite for deep dipping.