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-   -   What is the pressure valve on a case? (http://www.firearmstalk.com/forums/f18/what-pressure-valve-case-40738/)

nikotromus11 04-03-2011 04:43 PM

What is the pressure valve on a case?
 
I recently bought a foam gun case. It has a pressure valve that you open and close with a flat head screw driver. What is the purpose of this?

stag1 04-03-2011 04:46 PM

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.

ktmboyz 04-03-2011 04:51 PM

Not sure but did you look in the owners manual or the co website... not trying to be a smart a** just what I would prob do

nikotromus11 04-03-2011 05:08 PM

This is as much as I could find:

"Pressure valve quickly adjusts internal pressure in case of sudden changes in height or temperature"

JonM 04-03-2011 05:22 PM

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.

nikotromus11 04-03-2011 09:51 PM

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

c3shooter 04-03-2011 10:41 PM

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.

M14sRock 04-04-2011 02:03 AM

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.

JonM 04-04-2011 02:29 AM

Quote:

Originally Posted by nikotromus11 (Post 478710)
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.

Quote:

Originally Posted by c3shooter (Post 478735)
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.

Quote:

Originally Posted by M14sRock (Post 478952)
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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