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Leaking Ball Valve on Ghetto Gun

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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Leaking Ball Valve on Ghetto Gun

Unread postAuthor: The Kid » Sun Sep 30, 2007 5:31 am

well i made this last week and i found it leaks around the ball when the soda bottle is pressurized but no where else. i usually use about 120 psi in it and it leaks about 5 psi before i fire it and suggestions are much appreciated thanks.
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getto 001.jpg
The whole gun
getto 002.jpg
the ball in the valve
Last edited by The Kid on Sun Sep 30, 2007 5:52 am, edited 1 time in total.
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Unread postAuthor: chaos » Sun Sep 30, 2007 5:32 am

plenty of plumbers tape and/or pile on the epoxy :D
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Unread postAuthor: The Kid » Sun Sep 30, 2007 5:48 am

the valve is epoxyed and tafron taped on but thats no it the ball in the valve in the first picture the air is leaking around it
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Unread postAuthor: chaos » Sun Sep 30, 2007 5:58 am

so is it leaking amount the threads? or in the inner workings of the valve?

please use the spell-check feature, im almost finding it hard to understand some things you say
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Unread postAuthor: The Kid » Sun Sep 30, 2007 5:59 am

inner workings of the valve
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Unread postAuthor: Pete Zaria » Sun Sep 30, 2007 6:01 am

1) Leak test the gun (pressurized to 20 psi or so, with or without barrel attached) underwater in a sink or bath tub to verify that it is indeed the valve leaking and not the attachment point or the fill point (schrader? can't see in the pic).

2) If it is indeed the valve, try lubricating it. Silicon spray, lithium grease, or as a last-ditch, dishsoap will work - avoid petroleum based lubricants like WD40 or oil, they're bad for rubber seals.

3) If that still doesn't fix it... Get a new ball valve :)

4) Using the spellchecker wouldn't hurt you any :)

If it's not the valve... epoxy up wherever it's leaking.

Peace,
Pete Zaria.
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Unread postAuthor: chaos » Sun Sep 30, 2007 6:02 am

oh well it might very well be worn out, sorry but i don't think there's much you can do to fix this certain type of valve.

Where you from btw?
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Unread postAuthor: The Kid » Sun Sep 30, 2007 6:59 am

the valve is brand new and i would have only fired it 20 times kempsey australia and pete i sprayed soapy water on it and its leaking from the meatal part in the middle and yes there is a tyre valve (from auto shop) on it if i ever post it on cannons you'll see it
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Unread postAuthor: MaxuS » Sun Sep 30, 2007 7:53 am

I have the same ball valve, i tried to use it as a pilot on my 1.5" sprinkler valv, but the thing leaks like a sieve, its just because theyre crap.
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Unread postAuthor: The Kid » Sun Sep 30, 2007 8:21 am

damn i spent 10 bucks on that ,oh well
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Unread postAuthor: The Kid » Sun Sep 30, 2007 8:33 am

at the moment i am looking at MrCrowley's sga and looks like he has the same ball valve on his fill valve, i wonder
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Unread postAuthor: cdheller » Sun Sep 30, 2007 9:06 am

I guess i'll ask the obvious.

have you tried to tighten the seat,(the plastic/Teflon seal)?

It looks like a Allen wrench would work ,maybe whit some heat if they used thread locker compounds

or removing the metal retainer checking for fit and funtion and shimming it with washers to increase the seat pressure?
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Last edited by cdheller on Sun Sep 30, 2007 9:46 am, edited 1 time in total.
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Unread postAuthor: windshrike » Sun Sep 30, 2007 9:44 am

Use lots of lubricant and if it still leaks, replace it.
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Unread postAuthor: The Kid » Sun Sep 30, 2007 10:02 am

its the inside of the valve thats leaking not the connection to the bottle
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Unread postAuthor: MrCrowley » Sun Sep 30, 2007 10:25 am

The Kid wrote:at the moment i am looking at MrCrowley's sga and looks like he has the same ball valve on his fill valve, i wonder


I don't have it on there anymore, it was more or less a mock-up, but I do use one on another cannon and it's fine. Where are you from?
If you're not English and don't live in Europe I suggest you try and find a sprinkler valve, some pressure rated PVC and go from there.
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