Drain helium valve is a device designed for professional diving watch, you can exclude the residual high-pressure helium watch. In deep-sea operations, divers need to stay in high-pressure submersible tanks for long periods of time, but in general the air in the submersible tanks will use Heliox instead of the usual nitrox. Because under high pressure, nitrogen molecules will be integrated into nerve cells and cause varying degrees of anesthesia, the so-called "nitrogen drunk," if the use of pure oxygen, it may also cause oxygen in the brain. The advantage of helium is its low solubility, which is about 40% of the nitrogen dissolved in the body. Helium molecules are smaller and have a diffusion rate of 2.5 times that of nitrogen, so helium can be quickly excreted as the diver rises to the surface due to a sudden drop in pressure, thus reducing the time it takes to safely decompress. Long stay in a high pressure submersible tank, because the helium molecules much smaller than the water molecules, it will easily enter the waterproof case, make it filled with high-pressure helium. When the diver quickly returns to the surface of the water, if the watch's high-pressure helium can not be discharged for a short time, the case may burst due to high pressure. The row of helium valve (the vast majority of tables are now automatically helium), the backpack can quickly back the helium out of the shell to ensure the safety of the case.
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