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"Overkill" New 1.5'' Piston valve in progress! Vid

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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Unread postAuthor: Technician1002 » Mon Jul 25, 2011 9:33 pm

jhalek90 wrote:A 2" valve would be a waste, ad the flow is limited by the 3/4" hold in the neck of the bottle.


Some modification may be required. Here is my original tank.
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Here it is in the process of being fitted with the 2 inch valve.
Image

Class dismissed.
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Unread postAuthor: Mr.Tallahassee » Mon Jul 25, 2011 11:09 pm

Poland, metric OR SAE, OCC will screw it up anyway. :lol:
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Last edited by Mr.Tallahassee on Tue Jul 26, 2011 1:10 am, edited 1 time in total.
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Unread postAuthor: Crna Legija » Tue Jul 26, 2011 12:59 am

Mr.Tallahassee wrote:Poland, metric OR SAE, OCC will screw it up anyway. :lol:



question if i may, i need to buy tool for work and can only find metric and sae sets of sockets/spanners are sae the same as imperial?
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Unread postAuthor: Mr.Tallahassee » Tue Jul 26, 2011 1:08 am

SAE and Imperial are the same. SAE actually stands for Society of Automotive Engineers. They use the Imperial standards for tools. So yes, SAE tools are Imperial sizes.
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Unread postAuthor: Crna Legija » Tue Jul 26, 2011 1:22 am

Mr.Tallahassee wrote:SAE and Imperial are the same. SAE actually stands for Society of Automotive Engineers. They use the Imperial standards for tools. So yes, SAE tools are Imperial sizes.



ahh cool thanks
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Unread postAuthor: jhalek90 » Tue Jul 26, 2011 1:42 am

Tech, thats not a bad idea. I would still build a piston valve, but I might find a way to put a 2" nipple in there..

The tanks weighs 45lbs, and would make one hell of a 2"porting cannon.
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jackssmirkingrevenge wrote:I wonder... if you put flammable vapours inside a lady... could you get her to diesel?

POLAND_SPUD wrote:Anything is possible with the proper 3-way valve.
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Unread postAuthor: Technician1002 » Tue Jul 26, 2011 1:51 am

I do have photos online of ways to do that with thicker tanks. Here is a propane tank being cut for a 2.5 inch pipe.
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Unread postAuthor: Mr.Tallahassee » Tue Jul 26, 2011 1:59 am

Hehe, QDV anyone? Put a tee on that 2'' nipple and throw together a QDV. THAT would be scary! :shock:
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Unread postAuthor: Technician1002 » Tue Jul 26, 2011 2:55 am

Actually that tank is a coaxial QDV build.. Oh, nevermind, the heavy tank.

Completed 2 inch QDV and the in slow progress 2.5 inch.
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Unread postAuthor: Zeus » Tue Jul 26, 2011 3:35 am

Having a massive barrel/chamber in a roon temperature pneumatic is fine if you're using heavy projectiles, but room temperature air won't exceed the speed of sound by a great degree (It shouldn't exceed the speed of sound whatsoever, but it does sometimes)

Anyway, since we're on this topic, I have one of these and a twelve foot 3in barrel.

I don't think I could bring myself to wreck it, the appeal of a large shop compressor tank is too great.

And does anyone know the standard threading for such a bottle? It looks like 3/4 NPT/BSP/something, it's not LH, but that's all I can tell. And before someone tells me to measure it, my vernier calipers don't fit in the valve protecting ring.
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/sarcasm, /hyperbole
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Unread postAuthor: jhalek90 » Tue Jul 26, 2011 3:37 am

How did you secure the pipe nipple to the tank? Weld?
DO you think solder would hold a 2" nipple in place?
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jackssmirkingrevenge wrote:I wonder... if you put flammable vapours inside a lady... could you get her to diesel?

POLAND_SPUD wrote:Anything is possible with the proper 3-way valve.
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Unread postAuthor: Technician1002 » Tue Jul 26, 2011 3:46 am

For that pressure and no copper type socket for a solder connection, weld or hard braze.
I brazed the 2 inch and welded the 2.5 inch.
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Unread postAuthor: Mimikool » Tue Jul 26, 2011 4:22 am

Hi :)

On the first videos, the small flow induce a bgf mess of air, it should have a 10 meters barrel to exploit all HP air.

But with 2inch QDV ... a monster ! :D
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Unread postAuthor: jhalek90 » Tue Jul 26, 2011 5:17 am

Good thing I have 2.5 tears or brazing experience.... Only I'm used to brazing with oxy-acetaline, will I be able to do it with a simple propane torch?? I have no idea how how a propane torch burns.... To google!
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jackssmirkingrevenge wrote:I wonder... if you put flammable vapours inside a lady... could you get her to diesel?

POLAND_SPUD wrote:Anything is possible with the proper 3-way valve.
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Unread postAuthor: Technician1002 » Tue Jul 26, 2011 5:30 am

I used a welding torch, not propane.
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