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.
Working principle:
1. In normal state, the helium escape valve is waterproofed by the inner upper rubber ring, and this function is not available when the valve is locked.
2. Unscrew the valve, and the device is in a decompressed state at this time. At this time, the valve can also ensure the sealing of the watch.
3. When the pressure inside the gauge is sufficiently greater than the pressure outside the gauge, the rubber ring below the inside of the valve will be retracted to release the gas. Once the pressure is equalized, the lower rubber ring is pushed back to its original position by the spring. And this action will be repeated many times during the decompression process.
4. When the inside and outside are balanced, lock the valve.
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