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Innards of a "European" QEV

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Innards of a "European" QEV

Unread postAuthor: BeaverRat » Mon Sep 27, 2010 8:08 pm

Well, I decided to take apart one of my 3/4" European QEV's to model it accurately in GGDT. Here are the specs:

-3/4" (pipe threads) input/pilot, chamber, and exhaust ports
-3/4" (actual) diameter diaphragm seat
-1.5" diameter diaphragm (extrememly light)

This particular model works very well, becuase it has no support struts in the pilot and exhaust ports.
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Attachments
QEV1 Small.jpg
QEV2 Small.jpg
QEV3 Small.jpg
QEV4 Small.jpg
QEV5 Small.jpg
QEV6 Small.jpg
Last edited by BeaverRat on Tue Sep 28, 2010 5:12 pm, edited 1 time in total.
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Unread postAuthor: Gun Freak » Mon Sep 27, 2010 8:10 pm

Wow, the internals look very nice! Is it a diaphragm or a piston? I want to get my hands on one of those, but I don't really have the need for one. Hell maybe 10 of them will show up at my doorstep :D
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Unread postAuthor: BeaverRat » Mon Sep 27, 2010 8:32 pm

Yeah, it's pretty beautiful construction... It is nickle plated brass.

Oh, and it is a piston design. Plus, it opens far enough to have no flow restriction too!
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Unread postAuthor: inonickname » Mon Sep 27, 2010 9:04 pm

BeaverRat wrote:Yeah, it's pretty beautiful construction... It is nickle plated brass.

Oh, and it is a piston design. Plus, it opens far enough to have no flow restriction too!


It will still have flow restriction. You can't take air through bends like that and not lose flow or efficiency.

Nice photos. I have a belpro (rectangular) QEV and the innards are similar. The pistons are practically identical except for color.
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Unread postAuthor: BeaverRat » Mon Sep 27, 2010 9:47 pm

inonickname wrote:
It will still have flow restriction. You can't take air through bends like that and not lose flow or efficiency.


Of course, I am just refering to the fact that the distance the piston slides back is enough to theoretically provide no flow restriction.
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Unread postAuthor: jhalek90 » Mon Sep 27, 2010 9:54 pm

i bought 7 of these off of ebay for 35 dollars.

one thing to watch out for, if you take it apart, there is an o ring that you dont want to mess up in the pilot section. It seals the removable pilot side "cap"

in my experience, they work very very well, and are powerful little valves.

mine have been to 500 psi.... no problems yet.
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Re: Innards of European QEV

Unread postAuthor: jackssmirkingrevenge » Mon Sep 27, 2010 10:53 pm

BeaverRat wrote:This particular model works very well, becuase it has no support struts in the pilot and exhaust ports.


What do you expect, it's European :roll: :D
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Re: Innards of European QEV

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Unread postAuthor: Insomniac » Tue Sep 28, 2010 1:45 am

What, so Europeans don't have support struts in their pilot or exhaust ports? :? :D

Yes, I'm aware that this joke does not even make sense.
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Re: Innards of European QEV

Unread postAuthor: dewey-1 » Tue Sep 28, 2010 8:42 am

BeaverRat wrote:Well, I decided to take apart one of my 3/4" European QEV's to model it accurately in GGDT.
This particular model works very well, becuase it has no support struts in the pilot and exhaust ports.


The title implies that this style of QEV is only European.
It is not true. They are available world wide!

Rewrite the title to Inside a Piston Style QEV.

http://www.mead-usa.com/products/media/ ... athers.pdf

The difference is in how the valves ares constructed that determines the diaphragm type. They both use diaphragms, the difference is the shape.
Cup style are the "piston" type diaphragm. Both styles of constructions are available world wide.

McMaster Carr sells this brand;
http://www.deltrolfluid.com/pdfin-line/in-line17.pdf

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Last edited by dewey-1 on Tue Sep 28, 2010 3:34 pm, edited 1 time in total.
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Unread postAuthor: POLAND_SPUD » Tue Sep 28, 2010 8:49 am

well yeah but we refer to it using this term... that's due to the fact that it is the most popular QEV offered in europe, while in the USA those sold by mcmaster are more popular...

sure we can say something like 'that round QEV' but it doesn't make much sense
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Re: Innards of European QEV

Unread postAuthor: Ragnarok » Tue Sep 28, 2010 9:15 am

dewey-1 wrote:The title implies that this style of QEV is only European.

It's just what they get called. Not all that long ago, simply seeing the style of the QEV meant you could tell with some reliability whether the launcher had been built in Europe or the US.

It's not the best naming system out there, but it's like "American muffins" and "English muffins". Both can be made, or indeed bought, pretty much worldwide, but the naming still persists - it's good enough to differentiate the two.
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Last edited by Ragnarok on Tue Sep 28, 2010 4:18 pm, edited 2 times in total.
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Unread postAuthor: dewey-1 » Tue Sep 28, 2010 11:04 am

All I am saying is that both types are available world wide.

Edit content.
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Last edited by dewey-1 on Tue Sep 28, 2010 3:31 pm, edited 1 time in total.
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Unread postAuthor: Ragnarok » Tue Sep 28, 2010 11:34 am

Anyway, for the sake of doing something a bit more relevant to the thread's original purpose than worrying about naming, I disassembled my 1/2" QEV (Piston or European style, whichever you prefer) earlier, and took some measurements.

1/2" BSP threading.
35.1mm piston diameter.
14.2mm seat diameter.
4.4mm piston movement.
4.76 gram piston.
15.3 cc internal (chamber side) volume, not including volume in the threaded port.

Internally pretty much identical to the pictures above (save for the fact that a few years of use has introduced a light coating of muck to the internals).
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