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Sprinkler Valve Honking When Opening and Extremely Poorly

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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Sprinkler Valve Honking When Opening and Extremely Poorly

Unread postAuthor: nukewater » Tue May 29, 2012 6:55 pm

Hey guys, my first cannon, is a tshirt launcher. everything seemed great. Modified the sprinkler valve with a blowgun handle, and it has a dual tank for multi shots. When i pressure up my main tank to about 80psi and my second (firing) tank to about 60psi, pull the trigger, the gun expels the air and honks very loudly. But doesnt shoot the tshirt more than about 4 feet. I've read all i think i can find, but no real answer. Ive epoxied all openings, smeared grease on the diaphram.

My though, is when i got the valve and took it apart, there was some water inside, that someone had used it and returned it. So maybe the valve is faulty.


Any thoughts?

Making this tshirt cannon for our bands show this saturday so Im in a hustle to get this thing fixed


Thanks abunch guys!


-adam
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Unread postAuthor: 8tonsemi » Tue May 29, 2012 7:00 pm

If you go to the pneumatic forum section there is a sticky on it
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Unread postAuthor: mattyzip77 » Tue May 29, 2012 7:33 pm

Pictures help, and what type of sprinkler valve is it?? The water is not a big deal, for its what the valve is actually made for.
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Unread postAuthor: MrCrowley » Tue May 29, 2012 8:48 pm

This is what 8tonsemi was alluding to:
http://www.spudfiles.com/forums/sprinkl ... t8780.html

Might be some relevant info here as well:
http://www.spudfiles.com/forums/the-spr ... 16786.html
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Unread postAuthor: nukewater » Wed May 30, 2012 8:07 am

alright, a reply

this is the valve:

http://www.homedepot.ca/product/1-in-fn ... gbx/972741

anyways, thought it might have been too small of a pilot (was a blowgun) so I actually removed the blowgun, put my finger over the hole, charged it up, then released my finger... identical results, poor air flow and a long honk.

Anyways, figured the valve was pooched, bought a Ø1" plastic ball valve, hooked it up, and now the whole system works decent, as good as it can for a plastic ball valve i guess.

it's hard to find those sprinkler valves around here, its kind of rural, but when i find a new one, i'll reinstall it and see if it changes, but for now, i have a firing tshirt cannon :D ill try and post pics later
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Unread postAuthor: dewey-1 » Wed May 30, 2012 9:09 am

Purchase this one because this has been the easiest to modify and has been used for years. Plenty of how to's available.

Make sure to remove the white plastic filter from the diaphragm, make sure the manual bleed lever is closed and then epoxy the solenoid opening. Drill out the top to put a fitting for the blowgun.

http://www.homedepot.ca/product/1-in-fn ... gbx/972740
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Unread postAuthor: mattyzip77 » Wed May 30, 2012 9:30 am

Look at deweys pic above, your valve should have the same little white thing in it, take it out, and it should work. Btw when I asked for pics I meant of your actual valve and your link didnt work for me!
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Unread postAuthor: jhalek90 » Thu May 31, 2012 8:41 am

how did you plug the pilot hole with your finger at 60+ psi???

Im guessing you are doing something a little bit wrong...
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