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Semi-auto valve for under $20

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Unread postAuthor: jackssmirkingrevenge » Thu Mar 08, 2012 4:21 am

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Unread postAuthor: killerbanjo » Thu Mar 08, 2012 7:52 am

Haha, belive me i have looked, i have posted in that one thread and just dont want to bugger it up :lol: The other threads do apply but more so on the pneumatics part and not the electronics part :V
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Unread postAuthor: sagthegreat » Thu Mar 08, 2012 7:58 am

how big is your air chamber?
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Unread postAuthor: jackssmirkingrevenge » Thu Mar 08, 2012 8:19 am

killerbanjo wrote:Haha, belive me i have looked, i have posted in that one thread and just dont want to bugger it up :lol:


Have you looked up the circuit diagram for your particular compressor make and model? always a good place to start ;)

how big is your air chamber?


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Unread postAuthor: sagthegreat » Thu Mar 08, 2012 7:01 pm

now instead of a slide valve, would a blow gun work?
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Unread postAuthor: sagthegreat » Thu Mar 08, 2012 7:06 pm

jackssmirkingrevenge wrote:if you fit a longer barrel you could get away with much, much less pressure.


what do you mean, same power less pressure?

and what is your air chamber made off
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Unread postAuthor: JDP12 » Thu Mar 08, 2012 8:26 pm

a longer barrel allows the gasses from the chamber to expand more, thus releasing more energy to the projectile With a short barrel, the projectile is out the barrel before the gasses can expand completely thus wasting alot of that energy.

Also, please dont double post.
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Unread postAuthor: sagthegreat » Thu Mar 08, 2012 9:24 pm

thanks, pneumatics is still relatively new to me...
and would a blow gun work instead of a slide valve

srry for double post ^^^
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Unread postAuthor: JDP12 » Thu Mar 08, 2012 9:27 pm

well yes and no. A blowgun would pilot the QEV, but they don't work in the same way. A slide valve has the air input running through it. When you slide it back, it cuts off air supply, and vents the QEV. when it is returned to rest, air fills the chamber.

you could vent it with a blowgun, but then you'd need to input the air somewhere else... Don't really see why you'd use one. Slide valve is much easier, not that expensive. I have two of these QEVs and slide valves, love them both.
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Unread postAuthor: jackssmirkingrevenge » Fri Mar 09, 2012 12:20 am

thanks for saving me the bother JDP ;)

speaking of cheapo eBay parts, hmmm...

http://www.ebay.com/itm/Silver-Tone-Air ... 4162f88e9e
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Unread postAuthor: JDP12 » Fri Mar 09, 2012 7:26 am

Anytime, figured you already explained it once on Page 1 of this thread, id explain it for ya :wink:
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Unread postAuthor: killerbanjo » Mon Mar 12, 2012 12:11 pm

jackssmirkingrevenge wrote:
killerbanjo wrote:Haha, belive me i have looked, i have posted in that one thread and just dont want to bugger it up :lol:


Have you looked up the circuit diagram for your particular compressor make and model? always a good place to start ;)

Yes, it shows the schematic but no diagram and it is not clear because of this.
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Unread postAuthor: DEATHSTAR » Tue Apr 03, 2012 5:48 pm

hELLO,
I am new here and I mostly joined because of this thread.

I think IF a spring plunger was added to the chamber, it could easily make the slide move rear-ward.

Also it could have a magazine, w/ attached sleeve to block the barrel.
That's all, Thanks.
Also I just joined here for THIS ONE...
I am working on something right now where it will be VERY usefull!!!
Thanks bro.s.
Oh, I don't really mean "bro's since I have four of them already, but thanks spuddy buddys!!!!!!!!!!!!!!! 8)
P.S. I have some really cool ideas I'd like to share with you "folks" regarding two stages , recoiless, etc. thet I've been working on! :D
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Unread postAuthor: AircannonSweden » Tue Jul 17, 2012 2:17 pm

I have a question: how do you get this valve to work?i understand that is powerd by batteries but i don't understand how it is working? plz answer?

http://www.ebay.com/itm/1-4-Inch-NPT-2- ... 501wt_1163
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Unread postAuthor: jackssmirkingrevenge » Tue Jul 17, 2012 2:58 pm

Connect it to a 9 volt battery and a switch.

Every time you want to fire, press the switch!

You want full auto, you'll need a more complex timer circuit, there have been plenty of threads with wyz/dewey banter on that recently.
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