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piston in a cross?

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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piston in a cross?

Unread postAuthor: spudthug » Fri May 18, 2007 5:56 am

hi guys... i was wondering if u could have a piston inside of a cross instead of a tee? i think it would work and u could have 2 chambers or something without using a tee.... i wont try it because u cant gget tees around here but i wanted to get ur input...

oh and i will be posting a modified fire extinguisher handle that u can use as a pilot... i think i might use it on my newest qev gun to see how it works out... oh and btw if anyone still thinks that they have less flow than a blowgun they are completely wrong.. this has so much flolw that when i blow into it is like blowing through a 1/4 fitting it is like a automatic hole...
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4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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Unread postAuthor: jrrdw » Fri May 18, 2007 6:39 am

This thread i'm linking you to is about wooden pistons. On the 2nd page you will find my post, the pics show my wooden piston. The link in my post labeled "Action" is of my cannon, "The Basterd". I beleave it's not only the 1st wooden piston, but i think it's the 1st piston valve built into a cross.
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Unread postAuthor: experament-u2 » Fri May 18, 2007 6:39 am

i think it would work the same its basically just a Tee with another bit thinggy on the other side (sorry about language i don't know what to call it)
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Unread postAuthor: ShowNoMercy » Fri May 18, 2007 6:45 am

Yea why wouldnt it work? It may work better now that it would have equal pressure on both sides of the piston.
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Unread postAuthor: spudthug » Fri May 18, 2007 2:09 pm

a pisotn always has equal p[ressures on each side of it.. but i get waht u mean..the only bad thing is that there is no where to get a cross close to me...do they have crosses at lowes?
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4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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Unread postAuthor: VH_man » Fri May 18, 2007 2:53 pm

they only have DWV crosses at my lowes...... makes me mad. they dont sell pressure rated tees either...... but hey, i found out today i live next to a plumbing distributor, i get to take a trip there after school ends and my dad will pay for up to 100 bucks in parts.......... if they dont have pressure rated fittings ill be MAD
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Unread postAuthor: userjjb » Fri May 18, 2007 3:07 pm

Yes it will work fine.
<a href="http://www.spudfiles.com/spudtech_archive/viewtopic.php?t=15148">Cross Piston 1</a>
<a href="http://www.spudfiles.com/spudtech_archive/viewtopic.php?t=12392">Cross Piston 2</a>
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Unread postAuthor: jrrdw » Fri May 18, 2007 5:34 pm

userjjb wrote:Yes it will work fine.
<a href="http://www.spudfiles.com/spudtech_archive/viewtopic.php?t=15148">Cross Piston 1</a>
<a href="http://www.spudfiles.com/spudtech_archive/viewtopic.php?t=12392">Cross Piston 2</a>


Is there anyway to determin when these post where posted on Spudtech? I couldn't find posting dates???
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Unread postAuthor: MrCrowley » Fri May 18, 2007 5:48 pm

30 November 2006
04 February 2006
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Last edited by MrCrowley on Fri May 18, 2007 5:49 pm, edited 1 time in total.
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Unread postAuthor: Velocity » Fri May 18, 2007 5:48 pm

Yep, a bunch of cross pistons have been made in the past. I have considered it, but decided not to. You really do not get greatly increased performance from such a setup. It is much more advantageous to build two pistons valves and have them dump into a larger tee; it gives much greater flow and power too.
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