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Modded Sprinkler valve leaking.

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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Modded Sprinkler valve leaking.

Unread postAuthor: Rokmonkey » Thu May 29, 2008 6:36 pm

Okay, well I built this cannon over the winter to launch snowballs for my dog to go catch. He loves it, and it worked wonderfully. So I bring it out a couple months later and now my valve is leaking, so air goes straight out the barrel.

I have some pictures of my assembly, I think It's because air is not getting on top of the diaphram, but I could be completely wrong.


Whole Valve Assembly
Image

Looking down on the diaphram
Image

Lower diaphram taken out
Image

Part that sandwhiches the spring on the lower diaphram
Image

And the whole assembly disassembled
Image
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Unread postAuthor: Lentamentalisk » Thu May 29, 2008 6:55 pm

Make sure that any equalization holes in the diaphragm aren't clogged.
Make sure that there is no gunk in between the diaphragm and any faces it is supposed to seal against.
Thats all I can think of.
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Unread postAuthor: brogdenlaxmiddie » Thu May 29, 2008 6:57 pm

try puttin a lil bit of grease on it... like just a little bit, to help it seal a tad bit more... I had the same problem and it turned out to be the seal wasn't shutting and there was a lil bit of pvc shavings around it... try cleaning it with soap and water... and then put it back and see if it works -Tedder
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Unread postAuthor: Rokmonkey » Thu May 29, 2008 7:31 pm

Tried all those, and Im almost 100% positive nothing is plugging the equalization holes, unless some epoxy melted and dripped down into it.
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Unread postAuthor: nivekatoz » Thu May 29, 2008 8:57 pm

Im no expert, but you have a leak some place in the valve..If it were me I would pressurize the gun then dunk it in the bath tub just to see where all the leaks are..Than you can trouble shoot....Thats what was wrong with mine...
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Unread postAuthor: brplatz » Thu May 29, 2008 9:05 pm

i had the same problem and it was due to my blowgun not being screwed in all the way. i took it out and wrapped a ton of teflon tape on the nipple and screwed it back in. flawless ever since
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Unread postAuthor: Rokmonkey » Fri May 30, 2008 12:32 am

Alright I'll try tha brplatz.

Nivekatoz I can't pressureise the gun, since there is a leak in the valve it goes right out the barrel.
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Unread postAuthor: Hydra » Fri May 30, 2008 12:58 am

Out of the barrel? I think i know
In the valve outlet, theres like a little tube sticking out, which connects to that metal thing in the middle. the tube only "works" with a solenoid. With a blowgun that tube leaks air out. Just seal it with epoxy.
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Unread postAuthor: Lentamentalisk » Fri May 30, 2008 1:45 am

Hydra wrote:Out of the barrel? I think i know
In the valve outlet, theres like a little tube sticking out, which connects to that metal thing in the middle. the tube only "works" with a solenoid. With a blowgun that tube leaks air out. Just seal it with epoxy.

Rokmonkey wrote:...it worked wonderfully. So I bring it out a couple months later and now my valve is leaking, so air goes straight out the barrel.


It worked before, and now with a few months of sitting around it doesn't work.
Solenoids don't just disappear...
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Unread postAuthor: Rokmonkey » Fri May 30, 2008 10:46 am

Aye Hydra, that metal tube is filled with epoxy.
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