Do you know the helium escape valve?

The helium escape valve is one of the important symbols of diving watches. It usually appears in the form of a hidden button, which is used to discharge helium in the watch in the deep water area to balance the pressure difference between the inside and outside of the watch.


During the deep dive of the watch, as the water pressure increases, there are more helium molecules in the water than under the water molecules, and the tiny helium molecules will squeeze into the case from the gap of the watch under the action of strong pressure. At this time, the pressure in the case gradually increases, and the internal and external pressures are basically balanced. In this way, the watch can be well waterproofed in the deep sea and prevent the case from being broken and deformed.

When the diving is finished and the process of surfacing, the external water pressure decreases rapidly, and the helium molecules in the case are difficult to be eliminated in an instant, forming a huge pressure difference, which is enough to fly the top of the watch! In order to solve this problem, all deep diving watches are equipped with a helium escape device, so that the helium molecules in the case can be quickly removed in time during the ascent, so as to keep the internal and external pressures equal.