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good or bad piston idea ?

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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good or bad piston idea ?

Unread postAuthor: Britishninja » Sun Aug 07, 2011 8:54 am

im working on a barrel sealing piston valve and i could use some feed back on if this is a good design or not [/img]
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2011-08-06 14.50.10.jpg
and when it is put under pressure it will make a seal with the barrel and the shank washer on the coupling
photo.JPG
this is before its put under pressure

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Unread postAuthor: mattyzip77 » Sun Aug 07, 2011 9:01 am

ummmmmm, what in the good lords name is the soup can for??? Other than that, looks like it will work. What do you plan to house it in??? Please dont say the soup can?????
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Unread postAuthor: jsefcik » Sun Aug 07, 2011 9:04 am

I really hope he isnt using the soup can for part of the piston
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Unread postAuthor: Britishninja » Sun Aug 07, 2011 9:12 am

No this is going in a 3" tee haha I'm using the soup can as a piston haha I just cut it in half to show what I'm pitting in the piston
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Unread postAuthor: MRR » Sun Aug 07, 2011 9:40 am

To me it looks like it won't work at all.

1. When piloted, the soup can might move but the seal will stay in place because the spring is not strong enough to unseat it.

2. In the unlikely event that the sealing face unseats, the barrel will be covered by the soup can, resulting in massive flow restriction.
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Unread postAuthor: Britishninja » Sun Aug 07, 2011 10:03 am

So are you saying that I should get a stronger spring or just forget about this idea
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Unread postAuthor: MRR » Sun Aug 07, 2011 10:26 am

Like it is now I would say forget about it.

What do you try to achieve with this design?
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Unread postAuthor: Britishninja » Sun Aug 07, 2011 10:47 am

Being completely honest laziness by not getting the end of the barrel as square as possible
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Unread postAuthor: saefroch » Sun Aug 07, 2011 11:31 am

So get the end of the barrel more square, and use a simpler piston. This one will probably have serious difficulties piloting and deforming the sealing face.
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Unread postAuthor: goofygoober » Fri Aug 12, 2011 3:11 pm

i wouldn't use it
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Unread postAuthor: mattyzip77 » Fri Aug 12, 2011 5:04 pm

I think it is safe to say that this is not safe at all!! My suggestion would be back to the drawing board my friend!! You definatly get an A ++ for effort though!! :idea: :idea:
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