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The Sprinkler Valve (PDF File)

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: c11man » Thu Apr 09, 2009 9:39 am

my gun is a massive piston cannon and the stand will role back when fired so i need enought hose so i dont pull on the hose. i think i will start out with the 6 foot and try it and if it is too long i will just make a new hose.

aproxamity how big around is the inside of a sprinkler?
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Unread postAuthor: Hubb » Thu Apr 09, 2009 9:40 am

It's around 2", give or take...
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Unread postAuthor: c11man » Thu Apr 09, 2009 9:43 am

will 1.5inch pvc flattened work for the piston?

the circumfrance is biggenough but is there something that will make it not work?
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Unread postAuthor: Hubb » Thu Apr 09, 2009 9:44 am

I don't see why a 1" pvc would not work.
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Unread postAuthor: c11man » Thu Apr 09, 2009 9:45 am

in the book i think you said to use 2inch or bigger

the reduced thickness should reduce weight and increase preformance right?
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Unread postAuthor: Hubb » Thu Apr 09, 2009 9:49 am

There has to be a balance. You see, you will decrease the weight, but as you use thinner pipe, you will increase the travel time of the piston. 2" worked really well, which is what I recommended.

As far as the book goes, I just looked over it and I should change it to better reflect what I meant to say. After all, I didn't have a proofreader.
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Unread postAuthor: c11man » Thu Apr 09, 2009 9:56 am

speaking of the book i can not find anything about a check valve...

i will see if i can find some 2inch for the piston....
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Unread postAuthor: Hubb » Thu Apr 09, 2009 10:07 am

It's in there...in the piston section.
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Unread postAuthor: c11man » Thu Apr 09, 2009 10:26 am

i will download it again and see if i can find it
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Unread postAuthor: Hubb » Thu Apr 09, 2009 11:16 am

UPDATE:

I've added a section in the book to make an airtight piston as well as make a few grammatical changes. I've also removed the .ace download and put it straight on media file, since so many people were having problems with the unzip.

Enjoy
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Unread postAuthor: c11man » Thu Apr 09, 2009 11:55 am

i have a account with media file now but i says that the files is password protected. what is the password?
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Unread postAuthor: Hubb » Thu Apr 09, 2009 5:00 pm

c11man wrote:i have a account with media file now but i says that the files is password protected. what is the password?


Fixed. Sorry for any inconvenience.
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Unread postAuthor: c11man » Fri Apr 10, 2009 7:48 am

ok i got it now.

that airtight piston is a very good idea seems simple to make.
i am hoping that an airtight piston will be able to have a larger piolet volume because of the orings.
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Unread postAuthor: Hubb » Fri Apr 10, 2009 8:02 am

It works like any other airtight piston. AND, it works a lot better than the standard piston, allowing for just a bit more room for error, as most of us do not have a lathe to make precision cuts.

This weekend I should have some pics of mine and I'll edit the book once more, maybe even deleting the section on the standard piston. I think I'll also make a how-to of this and get it posted. Maybe others will begin doing this mod. I'd really like to see that...
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Unread postAuthor: c11man » Fri Apr 10, 2009 8:36 am

for the piston i was planning on useing some 1 1/2 sdr 21 for the disks that has a thickness of about 3/32. i was wondering if i should get a 1/16 or 1/8inch thick oring. the 1/16 would fit loose and float while the 1/8 would be more of a tight fit.

also why did you just leave the chat like that?
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