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Is there anyway to salvage my gun? (leak)

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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Is there anyway to salvage my gun? (leak)

Unread postAuthor: shimmer » Fri Nov 19, 2010 2:39 pm

I made a bad decision with the inlet valve of my pressure tank. I used a schrader valve from a bicycle, thinking if I left some of the rubber on the base, it would be able to seal the hole I drilled into my pressure tank. I tried to attach the rubber to the pvc, but it is not sealing.I've already put the entire gun together (pvp cement and all) and I was wondering if anyone had any ideas for how I could try to salvage it without having to scrap my pressure tank.

I tried sealing the space between the valve and the pvc with epoxy, but that didn't work.
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Re: Is there anyway to salvage my gun? (leak)

Unread postAuthor: jackssmirkingrevenge » Fri Nov 19, 2010 2:52 pm

shimmer wrote:I tried sealing the space between the valve and the pvc with epoxy, but that didn't work.


There's always a way with epoxy, you're not trying hard enough :)

Could we have a photo to help propose a viable solution?
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Unread postAuthor: Technician1002 » Fri Nov 19, 2010 3:26 pm

Actually drawing a vacuum on the tank and feeding windshield sealant (bonds to rubber) and then releasing the vacuum will let it set and seal in the leak. I used this on the fill valve on my Mouse Musket. No more fill valve leaks. Only a mild vacuum is needed to draw the sealant into the leak where it sets.
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Unread postAuthor: Selador » Fri Nov 19, 2010 3:30 pm

Technician1002 wrote:Actually drawing a vacuum on the tank and feeding windshield sealant (bonds to rubber) and then releasing the vacuum will let it set and seal in the leak.


Good idea, by Tech.

Or, you could go to your local tire store and ask for one of these.
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Unread postAuthor: Technician1002 » Fri Nov 19, 2010 3:35 pm

Those are hard to install in a finished air chamber. This is for the fix, not a new one.
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Unread postAuthor: mlz3000 » Fri Nov 19, 2010 6:06 pm

If it's possible to remove the schrader valve, you could cut through the chamber, then install the stem that Oxbreath posted, and then use a coupling to put the chamber back together.

Might not be the most elegant method (I would go with Tech's) but it might be easier.
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Unread postAuthor: chinnerz » Fri Nov 19, 2010 8:09 pm

all viable options and advice, however here is mine:

>take out the valve and remove all the rubber.
>go down to your local hardware store and pick up a 1/4 inch compressor fitting... the one with threads and one side and a hose barb on the other should do
Image
one of these.

>cut off the hose barb and make the hole a little wider... start small and work your way bigger going up .5 or 1mm at a time depending on what drill bits you have available.
>stop drilling when you can just push your valve through.
>Using a heat gun, blow torch or jet lighter; solder your valve in place.
>drill and self tap your valve into your gun.
> take it out and add some teflon tape and stick it in again.

obviously if you can get your hands on a threaded valve that would be your best bet, but if you can't then this is probably the way to go.
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Unread postAuthor: mlz3000 » Fri Nov 19, 2010 8:17 pm

I got one here.
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