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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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Unread postAuthor: WyldOne » Sat Dec 20, 2008 6:16 pm

hmmm valves = bit confusing for me!

I've got a rough idea of how it's all going to look but I don't know which valve would be best for me. As I say, I want to use maxium pressure. As soon as I hit that trigger, I want that ammo gone in a flick!

Would a BBMG be easier to make than a single shot BB gun?

I don't want to make anything that looks ugly or anything, I want it to be nice and a bit simple. I don't care if the vavle is beyond me cause my mate wouldn't mind joinning in on making one with me.
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Unread postAuthor: WyldOne » Sat Dec 20, 2008 6:28 pm

inonickname wrote:People seem to have problems with google and searching..

Ball valves are simple to use and cheap, but mostly you'll only get one shot (unless it's full auto/strafe). The problem with them is that the projectile has pretty much left the barrel before it's fully opened. You can use springs/elastic to help with this.

Modified sprinkler valves are basically sprinkler solenoids with the electrical component removed and a blowgun or similar valve used to pilot the diaphragm. Faster opening but more expensive and complex.

Then you have things like qev's, and then blow forward breeches, piston co-axials etc. Which are probably out of reach for your first time build.


Go to the BBMG/Strafer section and look at some of the CLOUD designs there. Fairly simple and sort of what you want. I'd probably leave a vortex alone for now.


I checked out ball valves on google adn i would say there not what i'm after.

I'll check out those other valves.
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Unread postAuthor: cheeseboy » Sat Dec 20, 2008 6:35 pm

the best valve for your needs is a QEV they are ready made piston valves so they have a great opening time and very good flow, you don't need to mod them or anything just make sure you know where to put the barrel, chamber and pilot valve, also QEV's most of the time fill from the pilot side. hopefully your friend will know how they work. I am not a fan off bbmg's due to the serious lack of airsoft bb's in australia and you can acheive huge velocity with a bb sniper. I strongly suggest making a single shot as you can make them look awesome. :newb:
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Unread postAuthor: WyldOne » Sat Dec 20, 2008 6:51 pm

Image

Is that how a QEV valve works? To see a better picture, click on it.


If so they look to be a a lil bit simple. I'm get a rough idea of how some valves work now! Just needa pick the right one for my needs!
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Unread postAuthor: STHORNE » Sat Dec 20, 2008 10:05 pm

awesome diagram. gives a good visual for those not understanding the mechanics of a QEV. good work WyldOne
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Unread postAuthor: john bunsenburner » Sun Dec 21, 2008 12:46 am

How about a sprinkler(Assuming you live in the us), Thing is they are a little bulky but still OK to use, or a blowgun but that needs big time modding. Hammer valves might be the right thing for you(http://www.instructables.com/id/Airgun-with-eXplosive-air-Release-Valve/). Otherwise QEVs are good, if you can find them. And a spring operated ball valve isnt all that bad...
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Unread postAuthor: WyldOne » Sun Dec 21, 2008 7:58 am

I'm from the land down under (Australia) by the way fellas.

All I need to know is which valve would best suit me! I don't care if it's tricky to mod or anhthing, I can do it!
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Unread postAuthor: jackssmirkingrevenge » Sun Dec 21, 2008 8:13 am

If you're making a BBMG, a simple blowgun will suffice as a valve. A QEV is more for single shot power, but you'd likely only get one or two useful shots per chamber fill.
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Unread postAuthor: WyldOne » Sun Dec 21, 2008 8:23 am

Ok guys, I've decided to make a single shot gun.

So a QEV valve would best suit me right?

Sorry if I've got questions going left, right and centre but we all have to start somewhere...

Also, which type of fire extinguisher do yours reccomend I should get? I'm also a voulnteer CFA fire fighter so getting a fire extinguisher will be no problem. I'll be using around 150psi too.
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Unread postAuthor: ALIHISGREAT » Sun Dec 21, 2008 8:47 am

WyldOne wrote:Also, which type of fire extinguisher do yours reccomend I should get? I'm also a voulnteer CFA fire fighter so getting a fire extinguisher will be no problem. I'll be using around 150psi too.


a CO2 fire extinguisher; they are rated for higher pressure.
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Unread postAuthor: jackssmirkingrevenge » Sun Dec 21, 2008 12:53 pm

Look into brian the brain's work, he's modded several QEVs for multiple shot operation and a fire extinguisher sized chamber should give you several good shots. If you want one shot per fill, look into a smaller chamber.
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Unread postAuthor: WyldOne » Wed Dec 24, 2008 8:20 am

Cheers!

OK, so would a QEV best suit me? I just need to make sure.

What could I use as a trigger? The fire extinguisher?
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Unread postAuthor: jackssmirkingrevenge » Thu Dec 25, 2008 2:48 am

I would go for a QEV, take out and discard the fire extinguisher's valve and use a blowgun for triggering, simple, cheap and effective.
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Unread postAuthor: WyldOne » Thu Feb 05, 2009 4:52 am

G'day guys,

My father got me a ball valve. I know its not a QEV valve but i'll still use it and see what I can make.

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Unread postAuthor: inonickname » Thu Feb 05, 2009 5:10 am

WyldOne wrote:G'day guys,

My father got me a ball valve. I know its not a QEV valve but i'll still use it and see what I can make.

Image


The ball valve performance will become boring. Springload it or actuate it with a ram or servo for better performance.
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