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Correct QEV

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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Correct QEV

Unread postAuthor: BlackWater18 » Thu Jan 31, 2008 8:00 pm

Hi I was wondering if this kind of QEV would work.

http://cgi.ebay.com/PARKER-MODEL-OR75B- ... dZViewItem

Thanks
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Unread postAuthor: A a r o n » Thu Jan 31, 2008 8:07 pm

Yes it would work.
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Unread postAuthor: BlackWater18 » Thu Jan 31, 2008 8:10 pm

alright thanks
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Unread postAuthor: pizlo » Thu Jan 31, 2008 8:56 pm

Nice find, though you could get one cheaper on mcmaster.
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Unread postAuthor: origin unknown » Thu Jan 31, 2008 9:05 pm

You could get one even cheaper than the mcmaster and the ebay one at Fastenal for $26 with in-store pickup so you don't have to pay for the shipping.
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Unread postAuthor: daberno123 » Thu Jan 31, 2008 9:07 pm

I agree with pizlo a 3/4" QEV from McMaster is only 20 dollars as opposed to that 24 dollar one
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Unread postAuthor: Zippster » Fri Feb 01, 2008 6:20 pm

Can someone PLEASE link to the McMaster QEV? I've been hearing about them having them all the time but couldnt find it on the site after extended periods of nothin but searching :x

What came up under 'quick exhaust valve' definitely was NOT a quick exhaust valve...
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Unread postAuthor: Pilgrimman » Fri Feb 01, 2008 6:25 pm

It won't let me link, but it's on catalog page 957. A picture labeled "F" is the type you want.
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Unread postAuthor: Zippster » Fri Feb 01, 2008 6:32 pm

I've seen that, but how is that a QEV? Dont they have 3 ports?
In other words, how would it work on a cannon? Just doesn't look anything like the QEV's I've seen on other cannons...

Or is the 3rd port just not shown

Edit : OK I get it now, just ignore this post
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Last edited by Zippster on Fri Feb 01, 2008 6:38 pm, edited 1 time in total.
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Unread postAuthor: Pilgrimman » Fri Feb 01, 2008 6:34 pm

The pilot is on top. You fill through there, and then exhaust it so that the piston moves back. It's kind of a cross between a piston and diaphragm valve, with more flow than a sprinkler.

Here's the wiki entry: http://www.spudfiles.com/spud_wiki/index.php?title=QEV

Edit: I was right. Look at the specs for the valve. It has 3 different categories: input, reservoir (I think, equivalent of chamber), and exhaust. The third port is on the bottom, so you can't see it easily. I thought you might be right in thinking it isn't the right one, and I got really scared, as I ordered one the other day! :D
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Unread postAuthor: Zippster » Fri Feb 01, 2008 7:02 pm

Off topic but didnt want to start another thread:
Are there any cheap valves that can selectivly direct flow to 2 sources, ie. one or the other? I was thinking about a double-barreled addon to my break action, but didnt want all the dead space of 2 ball valves.
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Unread postAuthor: frogy » Fri Feb 01, 2008 8:08 pm

Here's the catalog number of the McMaster 3/4" QEV...

6646K23

Simply type into McMaster search to order...

The easiest way to direct flow between two sources would be a 2\3 way valve... I forget what they call them, but they look like a Y tee but with a single ball valve that directs flow...

I don't think the dead space would effect firring much would it?
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Unread postAuthor: Gramanam » Thu Feb 07, 2008 7:35 pm

What is the maximum pressure the McMaster QEV can withstand?

I know that it says something like 125 PSI, but with people talking about using QEVs at around 200PSI I am wondering if this is true.
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Unread postAuthor: Ragnarok » Thu Feb 07, 2008 7:46 pm

Gramanam wrote:What is the maximum pressure the McMaster QEV can withstand?

I can't tell you that specifically ('cos I can't remember), but a lot of people (me included) are happy using various varieties at 300 psi or more. I believe the McMaster one would be usable at those pressures.
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Unread postAuthor: frogy » Thu Feb 07, 2008 10:16 pm

I'd imagine they can withstand at least 200 psi... They're nearly solid aluminum except for the small diaphragm and air ports...
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