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valve location

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valve location

Unread postAuthor: singularity » Sat Jul 22, 2006 10:57 pm

im working on a pneumatic cannon and i dont know which would provide better pereformace. heere is a diagram i drew (sorry i cant crop it)
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Unread postAuthor: carlbelcher » Sat Jul 22, 2006 11:49 pm

Having the valve closer to your barrel (bottom diagram) will offer slightly better performance, because you will have less dead space.
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Unread postAuthor: CS » Sun Jul 23, 2006 12:03 am

Do as above poster reccomended.

You can crop the photos. Just drag the dot in the lower right hand corner in paint. Im seriously thinking about righting a paint how-to manual for all you noobs! ARG!
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Unread postAuthor: sgort87 » Sun Jul 23, 2006 12:21 am

And now for the typical stirring-up of the conversation...

Lately it has been discussed on Spudtech, of the performance INCREASE because of some dead space. It all has to do with heat expansion and such. I'll see if I can find it...
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Unread postAuthor: singularity » Sun Jul 23, 2006 12:33 am

im sorry i have paint shop pro on my othere computer i know how to use that,its kinda sad i dont know how to use ms paint though :oops:

so is dead space good or bad?
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Unread postAuthor: carlbelcher » Sun Jul 23, 2006 12:42 am

Well if you ask gort (which I wouldn't :wink: ) it might be a good thing, but if you ask most people it's not.

The reason that dead space is not a good thing is that it is empty space that the compressed air coming from you chamber has to fill before it can start to force your projectile out the barrel, there by reducing the pressure and volume of air that is available to fire the projectile.
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Unread postAuthor: sgort87 » Sun Jul 23, 2006 2:03 pm

I was only throwing that in there. I know that in this case especially, being it a sprinkler valve, dead space must be kept to a minimum.

Put your valve on top irwinner. You want the least ammount of dead space with a sprinkler valve pneumatic.
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Unread postAuthor: LucyInTheSky » Sun Jul 23, 2006 2:28 pm

Well GGDT says by increasing the dead space slightly you make the gun better.
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Unread postAuthor: sgort87 » Sun Jul 23, 2006 5:51 pm

There is a point where it is too far of course.
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Unread postAuthor: frogy » Sun Jul 23, 2006 8:17 pm

A valve on the bottom is also easier to use for multiple guns if you must, since I haven't bound another sprinkler valve yet I use the same one on by big pneumatic as on my PB pneumatic and every time I have to change it I have to take out my 1/4" nipple and blow gun so it can clear the chamber since they run parallel...

But if you have the pipe coming out of the chamber long and the pipe after the 2 elbows short, the valve will be behind the chamber so it wont matter...

<img src="http://img170.imageshack.us/img170/6743/setuptypespn7.png">

On the top one you have to remove the blowgun or the hose barbs to get the valve off easily...

But the top one can be used if you make the pipe in between the 2 elbows LONG, but that just looks stupid...
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Unread postAuthor: singularity » Sun Jul 23, 2006 9:41 pm

why not just have the barrels be removable?
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Unread postAuthor: frogy » Sun Jul 23, 2006 10:47 pm

What are you talking about? barrels are always removable in a pneumatic unless it's coaxial, which they are also sometimes removeable...
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Unread postAuthor: singularity » Sun Jul 23, 2006 10:57 pm

sorry i got confused when i saw your picture and fow you were talking about removing the valves
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