Valsalva device
The Valsalva device is a device used in spacesuits, some full face diving masks and diving helmets to allow astronauts and commercial divers to equalize the pressure in their ears by performing the Valsalva maneuver inside the suit without using their hands to block their nose. Astronaut Drew Feustel has described it as "a spongy device called a Valsalva that is typically used to block the nose in case a pressure readjustment is needed."[1][2]
In November 2011 ESA astronaut Samantha Cristoforetti posted on Twitter a picture of her demonstrating the use of the Valsalva device in the Sokol space suit during suit pressurization.[3]
The Valsalva device has also been used for other purposes. On 25 May 2011, NASA reported that during the second spacewalk of Space Shuttle mission STS-134, Feustel was able to clear tears from his eye by wiggling down far enough in his Extravehicular Mobility Unit to use the Valsalva device in his suit as a sponge to clear up tears[1] caused because anti-fogging agent (liquid soap) came free from the inside of the helmet and floated into his eye.
On 3 April 2001, due to missing Valsalva device in his suit, astronaut Leland D. Melvin suffered an ear injury while training in Neutral Buoyancy Laboratory at Johnson Space Center.[4]
On 16 July 2013, EVA-23 was cut short as Luca Parmitano's helmet of his Extravehicular Mobility Unit suit started filling with water.[5] After the spacewalk during rapid repressurization of airlock, the Valsalva device on Luca's helmet failed and came apart while he tried to use it as it was not water proof.[6][7]
References
[edit]- ^ a b "US astronaut grapples with 'tears in space'". spacedaily.com. 25 May 2011. Retrieved 27 May 2011.
- ^ Sibley-Calder, Ian. "Q & A Medical 05/02 - Divernet". Diver Magazine. Archived from the original on 24 July 2014. Retrieved 22 April 2014.
- ^ Sam Cristoforetti [@AstroSamantha] (22 November 2011). "It's a Valsalva device, to equalize ears as pressure in suit increases" (Tweet). Retrieved 22 November 2012 – via Twitter.
- ^ "The training accident that almost ruined my chance to be an astronaut". Popular Science. 23 May 2017. Retrieved 2020-05-27.
- ^ "Spaceflight Now | Breaking News | Spacewalk aborted by spacesuit water leak". spaceflightnow.com. Retrieved 2020-05-17.
- ^ "EVA 23: exploring the frontier". Luca Parmitano. 2013-08-20. Retrieved 2020-05-17.
Good idea about the valsalva: I tried to use it while the airlock was being repressurized and it ripped right off. I have it here in my crew quarter as a souvenir.
- ^ Hansen, Chris. NASA SUITS Presentation: EVA 23, The Most Dangerous Spacewalk in US History. NASA. Event occurs at 51 minutes 50 seconds.
External links
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