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If I am not mistaken it is used to equalize the air pressure in the case to stop moisture from forming. Mainly needed when flying or changing extreme elevation.

Please someone correct me if i am wrong.
 

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its a pressure relief valve. cases that are air tight have them. its there to allow the user to relieve pressure slowly so the inside equalizes with outside air pressure. just opening the case can damage the lenses in optical devices such as cameras and scopes.

want to see it in effect take a empty pop bottle to the bottom of a swimming pool. or if they let ya an empty one on a plane open it at altitude close it then look at it when you land.

the relie valve should have a small stem in the middle to allow manual operation of the valve by simply pressing it.
 

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Discussion Starter · #6 ·
Thanks John M. Finally someone who knows what they are talking about. Do you know how to use it? Like, when I lock my gun up, do I close the valve to keep it air tight, and them before I open it up do I release the valve?

Sorry, this case did not have instructions for this.

Ryan
 

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In general, I do not like STORING guns in ANY case for extended periods. However, when putting gun into case, have valve open, close case, close valve, and open again before opening case. If shipping by air, leave valve open during shipment.
 

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I have several cases with pressure relief valves on them. The cases can be virtually impossible to open once suction has taken hold. But all of my cases are push button valves. None have a set screw.

I've never known optics to be affected by pressure changes. They are all purged with inert gasses.
 

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Thanks John M. Finally someone who knows what they are talking about. Do you know how to use it? Like, when I lock my gun up, do I close the valve to keep it air tight, and them before I open it up do I release the valve?

Sorry, this case did not have instructions for this.

Ryan
a brand and model plus pic would help.

In general, I do not like STORING guns in ANY case for extended periods. However, when putting gun into case, have valve open, close case, close valve, and open again before opening case. If shipping by air, leave valve open during shipment.
i agree definately no go on long term storage.

I have several cases with pressure relief valves on them. The cases can be virtually impossible to open once suction has taken hold. But all of my cases are push button valves. None have a set screw.

I've never known optics to be affected by pressure changes. They are all purged with inert gasses.
usually it doesnt. but it is possible. a sergeant in our unit opened the anpvs4 scope case for my m60 in flight without purging and it damaged the scope enough so it wouldnt turn on. nothing like shattered but it did break the electronics.
 
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