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| Helium release valve (HRV) do you really need one? | Rate Topic |
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| Posted: Sun Apr 22nd, 2007 10:17 pm |
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1st Post |
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Johnny P Advisor 
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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 Apr 22nd, 2007 10:31 pm |
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2nd Post |
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srh_pres 3T WIS 
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Thanks Johnny... I did not know that... hand6.gif
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| Posted: Sun Apr 22nd, 2007 11:03 pm |
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3rd Post |
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KenC Admin 
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Thanks, Johnny, but I already learned that from Vargas, who is a Master Watchmaker when he is not training Falcons or shooting (oops! - I mean) fighting the bull!
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| Posted: Mon Apr 23rd, 2007 03:20 am |
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4th Post |
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mcwright Admin 
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Very interesting and informative. Thanks! hand6.gif
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| Posted: Mon Apr 23rd, 2007 10:12 am |
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5th Post |
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Skipdawg 3T WIS 
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Yea thanks. Very good information. hand6.gif
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| Posted: Wed Dec 24th, 2008 07:03 pm |
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6th Post |
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oagaspar Site Founder 
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another educational post from JPhand6.gif
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| Posted: Thu Dec 25th, 2008 03:55 am |
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7th Post |
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dbruins 3T WIS
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I saw this feature on the Bell & Ross watches and asked my brother what it was for. He took an educated guess and guess right on! Wow ... he's a pretty fart smeller! 
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| TimeTechTalk.com > Time Tech Talk > Time Talk > Helium release valve (HRV) do you really need one? | Top |
