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Valve troubles

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: THUNDERLORD » Sun Jun 21, 2009 9:59 pm

DinerKid wrote:and suddenly i am back to the drawing board.


Add flow restriction(slightly opened ballvalve or cheap flow regulator, smaller tubing/pipe) and do it the way I mentioned earlier.

You stated that it worked when you did what jrrdw mentioned...same theory.

What c11man mentioned is worth experimentation..I've lost interest in sprinkler valves myself, (but I might as well get the most from the one's I still have).

Like I said before, about a week ago I used propane (Nothing more than pressure source), with tons of flow restriction, on a 1.5" chamber gun (srry, can't get exact volume now), and it BaWHUMPED fast enough for semi-auto. :) 8)
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-----SPEED,STRENGTH, AND ACCURACY.-----
"Procrastination" is five syllables for "Sloth".
Theopia 8)
Born To Be Alive!

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Unread postAuthor: DinerKid » Mon Jun 22, 2009 6:02 am

i know that would work it just defeats the purpose of the cannon. i want to be loading through the ball valve breech while it fills and once it is filled shoot it. if i had to turn off the air it would interupt the rhythm.

flow restrictions are alright i guess. i was really hoping for a quick gun but this seems like the best be at the moment.

i also ripped apart an old valve and pulled out the little equalizer tab leaving just a roughly 1/8 inch hole in the diaphragm compared to the microscopic one before. i will try this out and see it is no big deal if it is bad cause it is an old valve that i am done with. sadly i cant test it till i'm back from Hawaii in two weeks.
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Unread postAuthor: THUNDERLORD » Mon Jun 22, 2009 9:41 am

The fairly large chamber 1.5" I mentioned filled in a moment with propane, but that's the only time I used constant flow on a sprinkler valve myself.

The necessary chamber volume for PB's is much smaller so it should fill much faster, once you get it working the way you want (which I am sure is possible).

I just skimmed through 8 pages in the "How-To" section and sadly could not find a post there where a guy made a new diaphram for a S.V. using neoprene and a coin or washer. :( Maybe someone can link it(???)

The How-to's are looking a little crappy IMO, (out of place posts, nooby questions in "How-To's" etc.) Kind of sad even compared to about a year ago. Good to read through all in all though.

...no big deal if it is bad cause it is an old valve that i am done with. sadly i cant test it till i'm back from Hawaii in two weeks.


Maybe that's the problem (old valve?). The one I keep mentioning was new, freshly modded using a short lamp pipe and JB weld, very short pilot hose, and a blow nozzle.
Cool you're in Hawaii, I went there once, it was like a cartoon fantasy world!!! I suggest you try jumping off one of those huge lava diving rocks into the ocean and swim back.
Hope you update this when you get back in two weeks. 8)
I Gotta get back to my job hunt now.
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-----SPEED,STRENGTH, AND ACCURACY.-----
"Procrastination" is five syllables for "Sloth".
Theopia 8)
Born To Be Alive!

THUNDERLORD
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Unread postAuthor: DinerKid » Mon Jun 22, 2009 3:18 pm

the valve is in fine condition fresh off of a cannon i used for about a week. my chamber volume is 57 cubic inches. i think i may try the restrictions if the larger equalization hole doesn't work. perhaps i will try both the larger hole and the restrictions to use as little restrictions as possible.

thanks for your help.

alright so i just found a few minutes to try out the valve with the larger equalization hole it works great fills just fine and fires awesome. i am not finished with the new barrel but i tried it with an old single shot barrel and it is doing great. thanks everybody.
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