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what size QEV for new semi-auto?

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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what size QEV for new semi-auto?

Unread postAuthor: jmez1996 » Fri Feb 04, 2011 7:39 am

okay so i am working on a repeating QEV gun using this valve which i am going to buy http://cgi.ebay.com.au/Pneumatic-Quick- ... 1330wt_702
i plan on achieving semi-auto through either the same pilot system that this user used:http://www.spudfiles.com/forums/semi-auto-sniper-riflewith-damage-pics-t21406.html

or by using a regulated feed of air although i plan for it to be all self contained with no external tanks etc.

MY question is that using this will the 1/4 valve be effective or would it be better to use a 1/2 of the same type? (see link above for valve)

thanks for any help you can give me.
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Unread postAuthor: jackssmirkingrevenge » Fri Feb 04, 2011 7:57 am

using this will the 1/4 valve be effective or would it be better to use a 1/2 of the same type?


We need to know the size of barrel/ammunition you'll be using in order to answer this question.
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Unread postAuthor: jmez1996 » Fri Feb 04, 2011 8:07 am

oh right.. okay uhm i have several different sizes of stainless steel tubing but i will probably use one with a 6.5mm inside diameter (not exact)
also by semi-auto i would be happy with 5 shots +

cheers.
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Unread postAuthor: jmez1996 » Fri Feb 04, 2011 8:10 am

jackssmirkingrevenge wrote:
using this will the 1/4 valve be effective or would it be better to use a 1/2 of the same type?


We need to know the size of barrel/ammunition you'll be using in order to answer this question.


oh right.. okay uhm i have several different sizes of stainless steel tubing but i will probably use one with a 6.5mm inside diameter (not exact)
also by semi-auto i would be happy with 5 shots +

cheers.
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Unread postAuthor: jackssmirkingrevenge » Fri Feb 04, 2011 8:44 am

In that case, 1/4" should be more than enough, thought if you plan a reloading mechanism that uses the air pressure from the shot (such as for example a blow forward or blow back bolt, a 1/2" valve would certainly be beneficial.

For a manual bolt action though a 1/4" valve is perfectly suitable.
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Unread postAuthor: jmez1996 » Fri Feb 04, 2011 8:50 am

great thanks. yeh i plan on making a bolt action..
ill upload in a few weeks when i put it all together.
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