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mcmaster carr qev question

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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mcmaster carr qev question

Unread postAuthor: beans » Sun Apr 06, 2008 12:00 pm

I tried searching to see where I can find a QEV and I keep finding that mcmaster carr has them, but when I go to the site, I have no idea which one is the one I should be using for my spud cannon. All the cannon's I've seen have a brass T QEV but the website doesn't have anything like that, or at least I didn't see one... can anyone help me out? Sorry if I broke a posting rule, I'm new here.

Oh yeah, forgot to mention, this is to add onto my copper air cannon... the air chamber is 1 1/4 inch, but there is a 1 inch stretch to the ball valve I have on it right now, so a 1 inch QEV is what I'm looking for.
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Unread postAuthor: JDP12 » Sun Apr 06, 2008 12:49 pm

its on page like... 957 or something around there. The biggest is 3/4" threads
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Unread postAuthor: beans » Sun Apr 06, 2008 1:03 pm

which ones? the plastic ones? or the F one?

if you can give me a product number that would be awesome.
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Unread postAuthor: SpudFarm » Sun Apr 06, 2008 1:11 pm

metal = QEV
plastic = probably a sprinkler valve that is better for you use.
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Unread postAuthor: beans » Sun Apr 06, 2008 1:23 pm

yeah, I got that, but I don't see any QEV's that I've seen on the mcmaster site
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Unread postAuthor: D_Hall » Sun Apr 06, 2008 1:31 pm

6646K23

blah blah blah, adding words 'cause software doesn't like a one word response.
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Unread postAuthor: beans » Sun Apr 06, 2008 1:39 pm

the right angle one? how does that one work? all the ones I've seen are T shaped...
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Unread postAuthor: D_Hall » Sun Apr 06, 2008 1:45 pm

I'm not sure I follow the question. It works like a QEV.
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Unread postAuthor: beans » Sun Apr 06, 2008 1:49 pm

well, I guess the first qev I saw, and some other ones, are T shaped, like a tee for fitting three pipes...there's the outlet that goes to the barrel, the one pointing down goes to the air chamber, and the back one goes to where you pump the air in...you release a bit from the back, and it all goes out through the outlet to the barrel....the one on mcmaster is just a right angle with an inlet and an outlet, so does it work pretty much the same?
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Unread postAuthor: SpudFarm » Sun Apr 06, 2008 1:53 pm

what you have seen is a barrel sealing piston valve
http://www.spudfiles.com/forums/piston- ... t8157.html

you have to make them your self
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Unread postAuthor: beans » Sun Apr 06, 2008 1:55 pm

here
http://www.spudfiles.com/forums/dual-3- ... t4650.html

if I'm not mistaken, that guy is using two..the t shaped brass things, right?
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Unread postAuthor: D_Hall » Sun Apr 06, 2008 2:11 pm

beans wrote:well, I guess the first qev I saw, and some other ones, are T shaped, like a tee for fitting three pipes...there's the outlet that goes to the barrel, the one pointing down goes to the air chamber, and the back one goes to where you pump the air in...you release a bit from the back, and it all goes out through the outlet to the barrel....the one on mcmaster is just a right angle with an inlet and an outlet, so does it work pretty much the same?

'Tis all semantics. What you describe is what is refered to as a 90 degree design in the industry. Nobody really worries about where the pilot is. All they care about is the inlet and outlet are.... and in this case (your's and mine), they're separated by 90 degrees.
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Unread postAuthor: potatoflinger » Sun Apr 06, 2008 2:15 pm

The one that you want is the type "F" one, it is a tee shaped one like you have seen, you just can't see the other port in Mcmaster's picture.
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Unread postAuthor: beans » Sun Apr 06, 2008 2:33 pm

125 is the max psi for that? any way I can get a higher rated one?
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Unread postAuthor: beans » Sun Apr 06, 2008 3:12 pm

another questions I have is can I pick one of these up at a hardware store? or are they a specialty item that has to be ordered?
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