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Diaphram or piston valve gun mod

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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Diaphram or piston valve gun mod

Unread postAuthor: jitup » Mon Dec 08, 2008 10:59 pm

Hello,
I am working on modifing the below gun to have a diaphram valve. I can not find any information beside the short desctription in the Wiki. I know people have built this valve befor so ther has to be info some where. I appreciate any info or links to info that you can give me.
I will cut the ball valve out and give it interchangeable barrels
Thank you in advance.

PS sorry for the low pic. quality.
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Unread postAuthor: jackssmirkingrevenge » Tue Dec 09, 2008 4:29 am

A modified sprinkler valve is a diaphragm valve...
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Unread postAuthor: jitup » Tue Dec 09, 2008 2:59 pm

jackssmirkingrevenge wrote:A modified sprinkler valve is a diaphragm valve...


I relize this, but i would prefer to build my own. any one have any experience or good resources about the subject?
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Unread postAuthor: jackssmirkingrevenge » Tue Dec 09, 2008 3:27 pm

Details on how to make one here:

Image

Quite an old page, I remember it was the first I had found back in the day when I first discovered that others out there enjoyed propelling random objects at unreasonable velocities :D
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Unread postAuthor: jitup » Tue Dec 09, 2008 3:46 pm

JSR, you did it again! Thanks for the info. You are right, that must be an old page because they said nothing about propane meters!

But now the real question is if I can some how use this info in my set up. Hmm? let me do some thinking and tinkering, and I will get back to you guys. Just out of curiosity, which would be a better performer 1.5 inch diaphram, or a 1.5 inch piston? maybe I will try and build both, build my own chrony (the gun club will definetly not let me use theirs for a spud gun) and I will let you know.

Hmm.......

I am still a little perplexed about how i shall modify his design.
May be I will just build a seperate module and some how attach it?

I do not know yet.

EDIT: is ther some way I could put a piston valve on this thing so that it still stays "inline" withput using a T or other
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Unread postAuthor: jackssmirkingrevenge » Tue Dec 09, 2008 4:02 pm

I'm guessing the piston will work better, it might be generally heavier than a diaphragm so accelerate less but it will open to much better flow.
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Unread postAuthor: jitup » Tue Dec 09, 2008 4:04 pm

Hey JSR
do you have any ideas on how to put a piston on this thing while still keeping it "inline"
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Unread postAuthor: jackssmirkingrevenge » Tue Dec 09, 2008 4:09 pm

I might have a couple, but they involve copious quantities of epoxy resin ;)
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Unread postAuthor: jitup » Tue Dec 09, 2008 4:12 pm

I will pull out the siringes and get to mixing :twisted:
I want to ge some experience with more advanced valves before I venture out and build my copper muzzle loader
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Unread postAuthor: psycix » Tue Dec 09, 2008 4:12 pm

jitup wrote:Hey JSR
do you have any ideas on how to put a piston on this thing while still keeping it "inline"

Like a sprinkler valve:
The valve seat faces upward after a 90 degree turn, and the air then goes down after doing a 180 degree turn and then another 90 degree turn to get back inline.

There are a few cannons around which are built like this.
Very very compact and clean looking.
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Unread postAuthor: jitup » Tue Dec 09, 2008 4:14 pm

thanks psycix, if you have a link to any of these guns it would be great to see them before I start tinkering, wheter it be a piston or diaphram
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Unread postAuthor: jackssmirkingrevenge » Thu Dec 11, 2008 3:03 am

Why the objection to having the piston in a tee, given the configuration it would be a perfect layout for a piston on this launcher. If you still want to keep it "inline", the best thing to do is use a modded sprinkler valve, otherwise you're going to waste a lot of effort to make something that would have only cost you a few dollars to buy.
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Unread postAuthor: MrCrowley » Thu Dec 11, 2008 3:18 am

jitup wrote:Hey JSR
do you have any ideas on how to put a piston on this thing while still keeping it "inline"

http://www.spudfiles.com/forums/linear- ... 14957.html

It's entirely plausable and would have similar flow to that of a co-axial, I just haven't the reason or money to build it just yet.

Image
I would make a few changes but that's the last design I drew up, you get the idea though.
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Unread postAuthor: jackssmirkingrevenge » Thu Dec 11, 2008 3:34 am

Thanks MrC, I had that thread in mind, but as you said there seems no reason to go through the excess complexity.
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Unread postAuthor: jitup » Thu Dec 11, 2008 3:21 pm

thank you for all the help, but last night in a caffeen driven rage, I designed a valve that would fit well with this gun (alond with a 3" piston valve gun piloted by a 1.5 inch home made diapghram which is piloted by a modded blowgun. :twisted: )

It struck me that it was TOO simple of a plan and that I was over analyizing what I was trying to do. Basically it is a 1 or 1.5 inch piston (haven't decided yet) barrel sealing T Valve. I will use several 90 degree angles to rederect the flow of air into the bottom of the T and a 90 to rederect the Pilot of the valve down, from there I will mount a short lenght of house into the modded blow gun which will pilot the valve.

any input about this would be appreaciated
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