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2 Inch QEV Cannon

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Re: 2 Inch QEV Cannon

Unread postAuthor: farcticox1 » Mon Nov 13, 2017 5:20 pm

He only went and split Bamby in half, IN HALF :shock:
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Re: 2 Inch QEV Cannon

Unread postAuthor: Jamzearljones » Tue Nov 14, 2017 8:55 am

So... because I can’t leave well enough alone...

EF3BD865-F58A-4CCA-9461-7C715BE162B3.png


My only problem is; as it is plumbed now, it fills through the pilot valve. I have since discovered that my QEV does not allow me to fill it through the pilot valve. So basically I have a closed chamber with no way to fill it. I was thinking about tapping a fill plug and ball valve into it somewhere... I’m just not sure if the PVC will hold up to that... also... is that safe? Otherwise I’m going to end up taking the back end apart to include a Tee in somewhere.
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Re: 2 Inch QEV Cannon

Unread postAuthor: jackssmirkingrevenge » Tue Nov 14, 2017 1:01 pm

He only went and split Bamby in half, IN HALF


I'm guessing it was a modular archery target like this one.

Jamzearljones wrote:I’m just not sure if the PVC will hold up to that... also... is that safe? Otherwise I’m going to end up taking the back end apart to include a Tee in somewhere.


For a small diameter in thick PVC it's not usually a problem, something like a 1/4" threaded schrader valve should do the job depending on what you are using to fill.
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Re: 2 Inch QEV Cannon

Unread postAuthor: farcticox1 » Tue Nov 14, 2017 6:15 pm

I do that, try and get in to a join so you get double thickness, I usually epoxy them in as well, just to be sure :idea:

20170917_130705.jpg
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Last edited by farcticox1 on Wed Nov 15, 2017 5:49 am, edited 1 time in total.
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Re: 2 Inch QEV Cannon

Unread postAuthor: Jamzearljones » Wed Nov 15, 2017 2:13 am

jackssmirkingrevenge wrote:I'm guessing it was a modular archery target like this one.


Yes it was a modular archery deer, but the shot went clear through and split the union between the two halves to pieces. The deer is broken... but still usable. Needs more golf balls.

And now... MK-IV

I went scientific and tension tested a ¼ and a ⅜ NPT tap in PVC and decided to go with the ⅜. The fitting in the PVC was stronger by about 200 lbs when tested and it is still small enough to treat a 2” coupling like a flat surface. I did tap into a joint that used both the coupling and a SPGT fitting making it even thicker than just a normal PVC pipe in a coupling. It ended up working great, though the space was a little cramped for a ball valve and a fill plug. I included a short piece of hose to get around the confined space. The ball valve is now well protected and filling is easy. The hose also puts less leverage and stress on the ⅜ tapped hole than if I had been able to put the fill plug directly on the ball valve.

The last bit is the 1-½” matching QEV that just made its way into my hands. I’m thinking about reviving MK-III with it unless anyone has any other ideas for me? Also found a 2” sprinkler valve that I’m working on converting from electric to pneumatic.

Now for pictures!!!
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Attachments
EE4B9DB2-B142-4059-83BB-6E5D50033FCA.png
Me and my toy
BC70B1DF-8D0A-4F7B-B3F7-0207A3CE93CC.png
Balanced on my workbench
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The added hose piece for the fill plug.
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It tucks away. Though I just might make it shorter.
E16A1BDD-4D38-4CC5-88DE-96FA67FE4764.png
Close up of the 3/8” NPT Tap in
FF6DAC3A-19CA-493D-9158-9AA22F50C23E.png
I had to put a 2” PVC Union on the QEV in order to attach it in the fixed corner position.
D9B097DD-B4AF-43D4-9A31-9310104FCE1D.jpeg
Loss of chamber volume to the inner barrel was compensated by increasing the chamber length to almost double.
1007F906-A8E6-4CFC-BAAF-C747E687478A.jpeg
56” of barrel to the union on the QEV
4F2AD812-9E3C-4C6B-8FEC-1BC7A6F14500.jpeg
2” threaded fitting accepts barrel sleeve for golf balls.
05E24421-B801-4A1F-BB9E-00674F7F0519.jpeg
20286CDA-0596-4FD4-988B-CD02CB85E214.jpeg
Compilation of MK-I to MK-IV
EAB03449-CB72-419E-8E04-582B038C7290.jpeg
I found my QEV’s little brother!
AB50952A-30FA-442E-BD0A-71AB3ED2BFCB.jpeg
I may use the 1-½” QEV to revive MK-III.
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Re: 2 Inch QEV Cannon

Unread postAuthor: mrfoo » Wed Nov 15, 2017 5:23 am

Bloody hell.
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Re: 2 Inch QEV Cannon

Unread postAuthor: farcticox1 » Wed Nov 15, 2017 5:48 am

what he said :shock:
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Re: 2 Inch QEV Cannon

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Re: 2 Inch QEV Cannon

Unread postAuthor: jackssmirkingrevenge » Wed Nov 15, 2017 6:29 am

Jamzearljones wrote:The deer is broken... but still usable.


me_irl

I really have to commend you on the rapidity of your progress, excellent work!
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Re: 2 Inch QEV Cannon

Unread postAuthor: Jamzearljones » Wed Nov 15, 2017 10:13 am

I took this from another post because what I’m asking applies here. And now that you mention this it is going to bug me that I’m not using the valve correctly.
jackssmirkingrevenge wrote:
If this is done and no pressure goes to the trigger during fill up, my fear is that the gun may fire when the safety valve is switched and the pressure from the valve rushes to the trigger simulating/causing enough of a depressurization of the QEV.


If it's a commercial QEV, it would not seal if filled from the chamber side anyway.


Please elaborate? If you are referencing the 2” QEV I use, I did/do have this problem. My solution was to use a spring behind the main diaphragm that fits into a circular indent in the back of the case when the diaphragm is slammed open. I would prefer to use the valve as intended if there is a better/more correct way.? :?:
I attempted to fill through the pilot valve on MK-IV which is what lead to the fill plug tapping issue, so I don’t know how this could be intended to operate... because it evidently was successfuly used in service without the spring in place right up to a plant shutdown (which is how it came to me).
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Re: 2 Inch QEV Cannon

Unread postAuthor: jackssmirkingrevenge » Wed Nov 15, 2017 10:59 am

Typically, the piston of a commercial QEV is a cup seal that does not allow gas to flow to the pilot chamber, the logic being that you want to separate pilot vent and main vent. Without being able to see the internal configuration of your valve it's hard to tell if this is the case, do you have a part number on it?
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Re: 2 Inch QEV Cannon

Unread postAuthor: Jamzearljones » Wed Nov 15, 2017 6:27 pm

jackssmirkingrevenge wrote:Without being able to see the internal configuration of your valve it's hard to tell if this is the case, do you have a part number on it?


Hows this? I couldn’t figure out what I was looking for when I looked it up.

DFA08579-B3BC-48F2-BE93-01F50B68F8E4.png

DF385D6E-4F96-4234-8B76-1EBB64905C20.png


This is the back of the smaller one that I haven’t used yet.

43B40A1C-D6C1-483A-B5F4-F0B73CF68679.png


Heres the rest of today’s work. I finished the sdr21 sleeve by grinding out and inverting a 1-½” to 2”male threaded fitting on the end of the sleeve. The breech of the barrel fits snug through the union on the QEV. With the golfball barrel ready. I decided to split some solid 2” beech slabs
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531036A5-FF94-4A00-A558-6A55D1F7C232.png
212FC517-3E63-460D-A34B-F189270971B0.png
The barrel sleeve is almost 5 feet long
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97D5E029-E880-473F-82A0-AC25F2C696F6.png
D565DD2F-FE7A-490A-AE12-45273D0A0B84.png
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Re: 2 Inch QEV Cannon

Unread postAuthor: farcticox1 » Wed Nov 15, 2017 6:31 pm

They make stuff in Australia :shock:
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Re: 2 Inch QEV Cannon

Unread postAuthor: jackssmirkingrevenge » Wed Nov 15, 2017 8:15 pm

Smaller one is a Goyen RCAC25FS

Image

Larger one is a Goyen RCAC45FS

Image

The schematics I found aren't very clear but neither of them appear to allow air to go to the pilot area from the chamber.

farcticox1 wrote:They make stuff in Australia :shock:


Well they aren't there to fuçk spiders...
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Re: 2 Inch QEV Cannon

Unread postAuthor: Jamzearljones » Wed Nov 15, 2017 8:50 pm

More importantly to me, each of the diaphragms have a return spring so I was not wrong to fit one in. The missing springs might be how/why I got them :D I just imagine these valves back in the plant refusing to seal up and dumping air for an eternity and a half :bounce: :lol:
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