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qev valve piston valve same thing?

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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qev valve piston valve same thing?

Unread postAuthor: mach10 » Fri Mar 27, 2009 2:06 pm

what is the differences between a qev and a piston valve? Sory if this is a stupid question
ps what's a easy test qev?
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Last edited by mach10 on Fri Mar 27, 2009 2:20 pm, edited 1 time in total.
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Unread postAuthor: jeepkahn » Fri Mar 27, 2009 2:11 pm

Not a stupid question, but they are basically the same...
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Unread postAuthor: mach10 » Fri Mar 27, 2009 2:18 pm

Thanks jeepkahn people kept talking about qev guns and din't know a qev was.
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Unread postAuthor: Brian the brain » Fri Mar 27, 2009 2:29 pm

Mach 10...There is a button n the top of your screen called wiki.

You will find all the answers you ever need in there.
Not to be a donkey:
A Quick Exhaust Valve is a factory made, superfast piston valve, but with less flow than most homemade piston valves.
It's really easy to use.


I understand you are new here, but we can;t have all the new guys ask the same questions over and over. :roll:


So...read up and get ready to learn...
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: POLAND_SPUD » Fri Mar 27, 2009 3:52 pm

but with less flow than most homemade piston valves.
he meant that the biggest QEVs are 1" while while the size of a homemade piston valve is limited only by your imagination (and access to tools and materails to build it) :wink:

...uhmm I just thought you might get it wrong.. sorry if it's obvious
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Unread postAuthor: Brian the brain » Fri Mar 27, 2009 4:24 pm

No that's not what I meant.
A piston valve generally has the out-port further forward, so the air doesn't have to travel around a corner to get out.

Plus the piston travel of a QEV is minimal.
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: POLAND_SPUD » Fri Mar 27, 2009 4:40 pm

well what ever...
QEVs that have all that much dead space than a piston valve to be take this factor into consideration.. plus they are simply better made
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Unread postAuthor: jonnyboy » Fri Mar 27, 2009 5:12 pm

They are the same, a qev is just a manufactured piston valve.
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Unread postAuthor: POLAND_SPUD » Fri Mar 27, 2009 5:38 pm

well not quite... they are of much higher quality than an average piston valve
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Unread postAuthor: sgort87 » Sat Mar 28, 2009 2:05 am

Wait wait wait now. There are a lot of models designed with a diaphragm instead of a piston, which work less effectively. These are normally the smaller models and about any QEV made by Asco.
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