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QEV questions...

This area is for the discussion of BB or airsoft sub machine guns, and or other small arms such as pellets.
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QEV questions...

Unread postAuthor: Bully Dog Airsoft » Mon Jul 20, 2009 3:27 pm

Ok I need to have a photo of these internals shown to me because it makes no sense how the little tank fills with air and only opens when the qev pops, the ace scratcher for me is it's like two inches back from the tank how does that act as a valve? Call me stupid but it makes no sense to me haha. :shock:

http://www.youtube.com/watch?v=hUj_9HYVEY4
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Unread postAuthor: jackssmirkingrevenge » Mon Jul 20, 2009 3:30 pm

A QEV is essenially a piston valve.

For it to fire, a pilot valve has to empty the pilot chamber. Usually this is manually operated for a single shot, but by putting a safety valve as a pilot means that it will fire every time pressure reaches the pop-off level.

It's very well explained in the video, you are stupid ;) :D
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Unread postAuthor: Bully Dog Airsoft » Mon Jul 20, 2009 3:39 pm

So basically you replace the blow gun trigger for a qev to make it full auto? This seems relatively simple thanks!!! Now I got to go make a trip to ace haha! :idea:
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Unread postAuthor: jrrdw » Mon Jul 20, 2009 3:43 pm

Try looking stuff up in the "Wiki" you will be suprised how much info is in there. Members here at Spudfiles take great care and time in building the Wiki so new members can study and learn from it.

Welcome to Spudfiles.
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Re: QEV questions...

Unread postAuthor: spudtyrrant » Mon Jul 20, 2009 3:47 pm

Bully Dog Airsoft wrote: Call me stupid

stupid....jk

a qev works like a barrel sealing piston valve: http://www.spudfiles.com/forums/piston- ... t8157.html (second one down)
it seals against the barrel and moves back when the air is released from behind it expelling it through the barrel

In the video he is feeding continuous air into the chamber and using a pop-off valve( a valve that pops open when a specific amount of pressure is reached) to trigger the qev by releasing the air from behind the piston/diaphram.

since he is adding continuous air when the pop-off closes it reseats the piston and fills the chamber then the cycle repeats the faster he fills the chamber the higher rpm's the gun will shoot

edit: dang took me a while to write my message 3 comments were made while i as doing it
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Unread postAuthor: colty-bear » Mon Jul 20, 2009 4:13 pm

anybody know where i can get one of those self releasing pop offs?
also i found this video and i am going to make one can someone tell me the list of supplies for the valve

http://www.youtube.com/watch?v=b4ZgXqia ... re=channel
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Unread postAuthor: Bully Dog Airsoft » Mon Jul 20, 2009 6:03 pm

You should be able to get these at ace or home depot thats where I'm getting my stuff.
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Unread postAuthor: ckman » Mon Jul 20, 2009 6:07 pm

Yes I believe you should be able to get pop off valves at ace or home depot.
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Unread postAuthor: colty-bear » Mon Jul 20, 2009 7:00 pm

what if i live in a 1,800 people town in the middle of nowhere think bomgaars will have them?
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Unread postAuthor: jrrdw » Mon Jul 20, 2009 7:12 pm

I sense smartassary going on here??? You wouldn't know anything about that would you colty-bear?
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Unread postAuthor: colty-bear » Mon Jul 20, 2009 7:20 pm

what im not kidding i live in a town population 1,800 in the middle of nebraska
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Unread postAuthor: Ragnarok » Mon Jul 20, 2009 7:48 pm

Is a population of 1,800 even enough to count as a town?

Actually, I suppose it probably is. There's a city (St David's) in the UK which had 1797 inhabitants at the last census. Smallest city in the country (and to be precise, that country is Wales)

Anyone want to guess at the second smallest city in the UK?
Believe it or not, it's the (City of London), with a population of 7,185 at the last census. Technically, only about one square mile of the whole area that people think of as the city actually has legal status as such.

Anyway, I'm off-topic. I blame lack of sleep.
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Unread postAuthor: Mateo » Mon Jul 20, 2009 7:51 pm

or you could just use the internet and order one.... home depot has a website now :wink: haha
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Unread postAuthor: jackssmirkingrevenge » Mon Jul 20, 2009 10:12 pm

Ragnarok wrote:Actually, I suppose it probably is. There's a city (St David's) in the UK which had 1797 inhabitants at the last census. Smallest city in the country (and to be precise, that country is Wales)


Are you sure it's not Llanddewi Brefi :D
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Unread postAuthor: colty-bear » Wed Jul 22, 2009 10:33 pm

having troubles finding one online any links please?
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