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TimeTechTalk.com > 3T Official Brand Forums > Benarus Taucheruhren/SteVral > Question about manual Helium release valve |
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TimeTechTalk.com > 3T Official Brand Forums > Benarus Taucheruhren/SteVral > Question about manual Helium release valve |
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| Question about manual Helium release valve | Rate Topic |
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| Posted: Sun Jul 5th, 2009 12:35 pm |
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1st Post |
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soopah Guest
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My Barracuda has a manual Helium release valve (HRV), and some of the Sea Devils have them, too. My question is, is this separate valve really necessary? Wouldn't unscrewing the crown have the same effect (release any pressure inside the case)? Someone correct me if I'm wrong. Note, this question is not in reference to an automatic HRV as on the 1km and planned for the Megalodon. Just talking about unscrewing the crown being the equivalent of opening a manual HRV.
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| Posted: Sun Jul 5th, 2009 01:44 pm |
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2nd Post |
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Ilcollezionista 3T WIS
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IMHO: is not absolutely necessary! Last edited on Sun Jul 5th, 2009 01:45 pm by Ilcollezionista |
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| Posted: Sun Jul 5th, 2009 02:41 pm |
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3rd Post |
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DM71 3T WIS 
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Actually, the helium valve is useful for divers that goes at great depths for long period. Before reaching surface they have to spend long period in decompression bells which use a mixture like trimix, which contains helium. Because the helium molecules are very small, they go through the gaskets of the watch and increase pressure inside. To avoid damage like crystal pop out, you unscrew the valve to release pressure. Hope it helps. Last edited on Sun Jul 5th, 2009 02:43 pm by DM71 |
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| Posted: Sun Jul 5th, 2009 02:48 pm |
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4th Post |
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oagaspar Site Founder 
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it actually has no use to recreational divers and is nothing more than a aesthetic crown that someone a few years ago thought looked cool....if you use the 3T search engine you will find pages on this subject hand6.gif What does a Helium release (or relief) valve do? The purpose and function of the helium relief valve is a common point of confusion. It has nothing to do with normal underwater diving. Helium does NOT seep into the watch while the watch is in water at any depth. At approximately 250 feet, air becomes toxic due to changes caused by the high pressures at such depths. Special types of ocean exploration vessels are used by those who do very deep sea research. In some of these, a highly helium-saturated atmosphere is used to avoid the air toxicity effect. The purpose of a helium release valve is for people who wear their watch inside the helium-saturated environment for an extended period. Because helium is the smallest atom, it will seep through the watch's seals under the high air (not water) pressures in this environment. If the watch stays in this environment for an extended time, helium will continue to seep into the watch until the air pressure inside the watch (initially surface air pressure) equalizes to the air pressure in the environment. This becomes a problem when the vessel is brought back up and depressurized. The helium which seeped into the watch over a couple of days cannot seep out any faster. The excess pressure inside the watch needs a way to release faster than it seeped in. It is only in this situation that a watch needs a helium relief valve at all. If a relief valve was not on the watch, the excess pressure would likely escape by pushing the crystal out. More info: http://en.wikipedia.org/wiki/Helium_release_valve http://home.xnet.com/~cmaddox/helium_diving.html
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| Posted: Sun Jul 5th, 2009 02:54 pm |
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5th Post |
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Skipdawg 3T WIS 
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And besides all that. Helps some watches just look really cool. :cool: LOL :D woohoo.gifwoohoo.gifwoohoo.gif
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| Posted: Sun Jul 5th, 2009 04:00 pm |
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6th Post |
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Ilcollezionista 3T WIS
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This is true! As my Sea Devil hearteyes.gif Skipdawg ha scritto: [...] Helps some watches just look really cool. :cool: LOL :D
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| Posted: Sun Jul 5th, 2009 06:13 pm |
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7th Post |
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Nabco 3T WIS 
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Considering the farthest I ever go in the ocean is up to my ankles smile8.gif if I'm wearing my CX 12,000 Footer I've been know to go in up to my calves  That said....I'm with Skip, I like HRVs because I think it makes the watch look cool woohoo.gif
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