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300psi QEV, Poland, Jack, anyone...........?

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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300psi QEV, Poland, Jack, anyone...........?

Unread postAuthor: evilvet » Tue Nov 06, 2012 10:53 pm

Hi guys

Can you advise based on your experience an eBay or other source for a QEV in 1/4" that will take 300psi ?

My searches turn up a few usual suspects from HK but all state 10kgf/cm2 which I make to be 150psi. This is actually not for a cannon; I am helping a mate with a pneumatic ram but figured you might have a lead.

TIA
(sellers that will post to Oz would be useful :) )
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Unread postAuthor: jackssmirkingrevenge » Tue Nov 06, 2012 11:39 pm

This type (QE-04) should do you nicely at 300: http://www.ebay.com/itm/Pneumatic-QE-04 ... 4607eda7dc

Note however that the output is 5/8".

This type is 3/4" throughout but more expensive: http://www.ebay.co.uk/itm/Pneumatic-3-4 ... 2324c9d6ea

They state low working pressures but the construction can stand up to a lot more, the ones I've seen are really quite well made.
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Unread postAuthor: Zeus » Tue Nov 06, 2012 11:51 pm

I bought this one, arrived in 9 days, handles 450psi regularly, can't recommend it enough.
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Unread postAuthor: jackssmirkingrevenge » Wed Nov 07, 2012 12:32 am

Zeus wrote:I bought this one, arrived in 9 days, handles 450psi regularly, can't recommend it enough.


This one ;)

Same as the second one I linked to but 1/4".

evilvet, what diameter is the ram, and what will it be used for?
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Unread postAuthor: POLAND_SPUD » Wed Nov 07, 2012 1:11 am

can't help now as I am leaving for work soon

might I ask what will it be used for ? if it's for increasing venting speed of a single acting air cylinder (so what these things are normally used for) then 1/2" might be an overkill... well unless the air cylinder is really huge
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Unread postAuthor: archie370 » Wed Nov 07, 2012 6:07 pm

Why can't you make one that will withstand that amount of pressure ... ?
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Unread postAuthor: Zeus » Wed Nov 07, 2012 6:11 pm

Because a homemade valve won't withstand tens of thousands of cycles, whereas that's what a QEV does. And the fella who's getting the valve may not know how to service it.

Thanks for fixing that up JSR.
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Unread postAuthor: archie370 » Wed Nov 07, 2012 6:15 pm

Mmm that is a good point that didn't even cross my mind ....
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Unread postAuthor: evilvet » Wed Nov 07, 2012 11:32 pm

Thanks all, much appreciated.

I don't know much about the application, we were discussing engineering problems over seven or eight glasses of red watching the Melbourne Cup and the question arose on how to get a large volume of air in a very short time.

I suspect it has to do with delivering material into a furnace as that is what my mates main game is, furnace engineering.

Thanks again
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Unread postAuthor: jackssmirkingrevenge » Wed Nov 07, 2012 11:46 pm

Even a smaller bore (say 1/4") QEV should be adequate in that case, and better suited to take higher pressures.
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