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SGTC Megah valve build

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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SGTC Megah valve build

Unread postAuthor: Velospud » Sun Feb 24, 2013 1:09 pm

Its been about 5 years since I touched a spud gun (had one explode in my hands at 80psi 5.51BAR) was not pretty. but I learned a lot from that day especially on the use of pressure rated pvc.

Anyways here's my coming out of retirement build, its a "megah valve" with 3" ports on a 4" tee, giving it twice the surface area as the supah valve maybe I'll be shooting some 10' 2x4s lol.

I got the tee and 5" pvc round stock off ebay. the tee is schedule 80 it is a BEAST.

My design allows for an 1" of piston movement which should be more than sufficient according to my fellow engineers.

got about 14 hours of work and 80 dollars in this unit so anyone who thought the supah valves cost too much build one yourself and you'll see why.

nuff talking, here is a bunch of pics and a test shot I'm waiting on some fittings in the mail for the barrel

http://www.youtube.com/watch?v=PxM1UfqF ... Yg&index=1

<a href="http://s1269.beta.photobucket.com/user/vincedahl/media/megah%20valve/IMG_0088_zps533c166e.jpg.html" target="_blank"><img src="http://i1269.photobucket.com/albums/jj593/vincedahl/megah%20valve/IMG_0088_zps533c166e.jpg" border="0" alt=" photo IMG_0088_zps533c166e.jpg"></a>

<a href="http://s1269.beta.photobucket.com/user/vincedahl/media/megah%20valve/IMG_0092_zpsd54fbe2d.jpg.html" target="_blank"><img src="http://i1269.photobucket.com/albums/jj593/vincedahl/megah%20valve/IMG_0092_zpsd54fbe2d.jpg" border="0" alt=" photo IMG_0092_zpsd54fbe2d.jpg"></a>
<a href="http://s1269.beta.photobucket.com/user/vincedahl/media/megah%20valve/IMG_0093_zps98ac213f.jpg.html" target="_blank"><img src="http://i1269.photobucket.com/albums/jj593/vincedahl/megah%20valve/IMG_0093_zps98ac213f.jpg" border="0" alt=" photo IMG_0093_zps98ac213f.jpg"></a>
<a href="http://s1269.beta.photobucket.com/user/vincedahl/media/megah%20valve/IMG_0109_zpseb9bc1d2.jpg.html" target="_blank"><img src="http://i1269.photobucket.com/albums/jj593/vincedahl/megah%20valve/IMG_0109_zpseb9bc1d2.jpg" border="0" alt=" photo IMG_0109_zpseb9bc1d2.jpg"></a>
<a href="http://s1269.beta.photobucket.com/user/vincedahl/media/megah%20valve/IMG_0103_zps95a098b6.jpg.html" target="_blank"><img src="http://i1269.photobucket.com/albums/jj593/vincedahl/megah%20valve/IMG_0103_zps95a098b6.jpg" border="0" alt=" photo IMG_0103_zps95a098b6.jpg"></a>
<a href="http://s1269.beta.photobucket.com/user/vincedahl/media/megah%20valve/IMG_0108_zps118bcfd8.jpg.html" target="_blank"><img src="http://i1269.photobucket.com/albums/jj593/vincedahl/megah%20valve/IMG_0108_zps118bcfd8.jpg" border="0" alt=" photo IMG_0108_zps118bcfd8.jpg"></a>
<a href="http://s1269.beta.photobucket.com/user/vincedahl/media/megah%20valve/IMG_0115_zps87c24e45.jpg.html" target="_blank"><img src="http://i1269.photobucket.com/albums/jj593/vincedahl/megah%20valve/IMG_0115_zps87c24e45.jpg" border="0" alt=" photo IMG_0115_zps87c24e45.jpg"></a>
<a href="http://s1269.beta.photobucket.com/user/vincedahl/media/megah%20valve/IMG_0114_zpsf286dfcb.jpg.html" target="_blank"><img src="http://i1269.photobucket.com/albums/jj593/vincedahl/megah%20valve/IMG_0114_zpsf286dfcb.jpg" border="0" alt=" photo IMG_0114_zpsf286dfcb.jpg"></a>
new spring
<a href="http://s1269.beta.photobucket.com/user/vincedahl/media/megah%20valve/IMG_0111_zps468d5bb6.jpg.html" target="_blank"><img src="http://i1269.photobucket.com/albums/jj593/vincedahl/megah%20valve/IMG_0111_zps468d5bb6.jpg" border="0" alt=" photo IMG_0111_zps468d5bb6.jpg"></a>
<a href="http://s1269.beta.photobucket.com/user/vincedahl/media/megah%20valve/IMG_0125_zpse0953159.jpg.html" target="_blank"><img src="http://i1269.photobucket.com/albums/jj593/vincedahl/megah%20valve/IMG_0125_zpse0953159.jpg" border="0" alt=" photo IMG_0125_zpse0953159.jpg"></a>


http://www.youtube.com/watch?v=PxM1UfqF ... Yg&index=1
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Unread postAuthor: matti » Sun Feb 24, 2013 3:00 pm

Nice work ! I personally would have used something else then PVC for the piston and made it barrel sealing, but It's still a very nice valve :wink:
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Unread postAuthor: jrrdw » Sun Feb 24, 2013 3:31 pm

Nice work. Would like to see the rest of the launcher....

Welcome to Spudfiles! :D
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Unread postAuthor: Velospud » Sun Feb 24, 2013 4:04 pm

Thanks guys launcher is coming along, like I said I'm just waiting on shipping for the rest of the fittings.

does anyone know of local stores that sell 6" solid core pvc pipe? because right now my pressure tank is only 4".

I will have some better pics and video up in a bit
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Unread postAuthor: Velospud » Sun Feb 24, 2013 4:52 pm

Here is a big snowball getting annihilated
http://www.youtube.com/watch?v=M0gpbIOr ... e=youtu.be

<a href="http://s1269.beta.photobucket.com/user/vincedahl/media/IMG_0318_zps88ecc78d.jpg.html" target="_blank"><img src="http://i1269.photobucket.com/albums/jj593/vincedahl/IMG_0318_zps88ecc78d.jpg" border="0" alt=" photo IMG_0318_zps88ecc78d.jpg"></a>
<a href="http://s1269.beta.photobucket.com/user/vincedahl/media/IMG_0317_zps39190b7d.jpg.html" target="_blank"><img src="http://i1269.photobucket.com/albums/jj593/vincedahl/IMG_0317_zps39190b7d.jpg" border="0" alt=" photo IMG_0317_zps39190b7d.jpg"></a>
<a href="http://s1269.beta.photobucket.com/user/vincedahl/media/IMG_0316_zps47381a3c.jpg.html" target="_blank"><img src="http://i1269.photobucket.com/albums/jj593/vincedahl/IMG_0316_zps47381a3c.jpg" border="0" alt=" photo IMG_0316_zps47381a3c.jpg"></a>
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Unread postAuthor: spudn00bie » Sun Feb 24, 2013 5:19 pm

Cold+PVC Tisk Tisk Tisk
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Unread postAuthor: MrCrowley » Sun Feb 24, 2013 5:31 pm

PVC does become quite brittle at temperatures near freezing so you have to be careful when handling the cannon to make sure it doesn't bump in to anything. I would also advise against multiple firings in cold temperatures.

You should read the relevant parts of these documents too:
http://www.vinidex.com.au/files/technic ... pplica.pdf

http://www.leesupply.com/userfiles/pdfs ... Manual.pdf (page 35>)
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Unread postAuthor: Velospud » Sun Feb 24, 2013 5:53 pm

spudn00bie wrote:Cold+PVC Tisk Tisk Tisk


it was like 40 degrees out today no worries. I was a safe distance away from it too, tisk tisk.
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Unread postAuthor: Velospud » Sun Feb 24, 2013 6:08 pm

MrCrowley wrote:PVC does become quite brittle at temperatures near freezing so you have to be careful when handling the cannon to make sure it doesn't bump in to anything. I would also advise against multiple firings in cold temperatures.

You should read the relevant parts of these documents too:
http://www.vinidex.com.au/files/technic ... pplica.pdf

http://www.leesupply.com/userfiles/pdfs ... Manual.pdf (page 35>)


Thanks for the info quality links right there.
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Unread postAuthor: Lockednloaded » Sun Feb 24, 2013 11:14 pm

What's with the bolts on the chamber side of the valve?
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Unread postAuthor: Velospud » Mon Feb 25, 2013 12:02 pm

Lockednloaded wrote:What's with the bolts on the chamber side of the valve?

That's me not trusting the glue lol. At 100psi There is over 1500lbs of force trying to push that fitting out
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Unread postAuthor: jrrdw » Mon Feb 25, 2013 12:16 pm

Well when you get the rest built you should take a red king size bed sheet to the jump field, paint a black dot in the middle, get the cannon ready, make the jump, take the shot during freefall while filming the results from the Gopro and ground levels and if you hit the bulls eye that would be shot of the century! :D

Wishfull thinking but probably not going to happen? Huh????
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Unread postAuthor: Velospud » Mon Feb 25, 2013 5:00 pm

jrrdw wrote:Well when you get the rest built you should take a red king size bed sheet to the jump field, paint a black dot in the middle, get the cannon ready, make the jump, take the shot during freefall while filming the results from the Gopro and ground levels and if you hit the bulls eye that would be shot of the century! :D

Wishfull thinking but probably not going to happen? Huh????


It could be doable lol. I would have to get my pro license though so I could jump over a farm field away from buildings and expensive planes I don't think the airport owners would appreciate holes in the roof of their hanger lol. Be a long shot too were supposed to pull by 3500 ft
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Unread postAuthor: jackssmirkingrevenge » Tue Feb 26, 2013 1:58 am

Good stuff!

Looking forward to seeing some heavy things being thrown at reasonable velocities towards discarded domestic appliances :D
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Unread postAuthor: mattyzip77 » Tue Feb 26, 2013 3:54 pm

Hmmmm, looks like you took all of the parts from a supah valve and put them in another tee..... Very cool upgrade though!! :D
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