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300psi QEV, Poland, Jack, anyone...........?
Posted: Tue Nov 06, 2012 10:53 pm
by evilvet
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
)
Posted: Tue Nov 06, 2012 11:39 pm
by jackssmirkingrevenge
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.
Posted: Tue Nov 06, 2012 11:51 pm
by Zeus
I bought
this one, arrived in 9 days, handles 450psi regularly, can't recommend it enough.
Posted: Wed Nov 07, 2012 12:32 am
by jackssmirkingrevenge
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?
Posted: Wed Nov 07, 2012 1:11 am
by POLAND_SPUD
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
Posted: Wed Nov 07, 2012 6:07 pm
by archie370
Why can't you make one that will withstand that amount of pressure ... ?
Posted: Wed Nov 07, 2012 6:11 pm
by Zeus
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.
Posted: Wed Nov 07, 2012 6:15 pm
by archie370
Mmm that is a good point that didn't even cross my mind ....
Posted: Wed Nov 07, 2012 11:32 pm
by evilvet
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
Posted: Wed Nov 07, 2012 11:46 pm
by jackssmirkingrevenge
Even a smaller bore (say 1/4") QEV should be adequate in that case, and better suited to take higher pressures.