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PVC Welding screwup!

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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PVC Welding screwup!

Unread postAuthor: pyro6314 » Wed Apr 18, 2007 6:06 pm

Unfortunately I just finished my new Golf Ball Cannon and my shaved bushing I made for the front of my barrel sealing piston valve leaks badly after it was glued. Any suggestions for a fix other than hacking it apart or starting over :evil:
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Attachments
IMG_0016.jpg
IMG_0017.jpg
Obviously not glued yet here...
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Unread postAuthor: hi » Wed Apr 18, 2007 6:09 pm

you could always epoxy it, that worked for me.
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Unread postAuthor: pyro6314 » Wed Apr 18, 2007 6:10 pm

Its already all glued together...and I mean everything. Except the back of the valve of course.
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Unread postAuthor: goathunter » Wed Apr 18, 2007 6:11 pm

JB Weld.That is the only thing i've found that can really stick to PVC.
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Unread postAuthor: hi » Wed Apr 18, 2007 6:14 pm

pyro6314 wrote:Its already all glued together...and I mean everything. Except the back of the valve of course.


yes, but epoxy isn't pvc glue for obvious reasons. it works, and as goathunter said, JB Weld works very well.
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Unread postAuthor: Fnord » Wed Apr 18, 2007 6:22 pm

Here's another quick question:
What sticks well to aluminum? I have to seal a small bit of aluminum in my propane meter. I tried epoxy, but it leaks like crazy, even when i roughen the surface.
Tried to seal up the epoxy leaks with superglue but that didnt help at all. Basically anything that will hold 130 psi will work. I dont have any jbweld or bondo atm, but anyone ever tried using that roofing caulk? I asked because I dont want to wait a week for it to dry only to find that it doesnt seal.
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Unread postAuthor: schmanman » Wed Apr 18, 2007 6:41 pm

teflon tape. :wink:
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Unread postAuthor: rad14701 » Wed Apr 18, 2007 6:45 pm

Knock knock people... The problem here is that pyro6314 already glued the whole valve together and the piston leaks at the barrel seat... He doesn't need JB-Weld or epoxy... His question is more along the lines of whether there is a way to un-glue the PVC joints so he can get to the piston... He wants to know if there is a fix without cutting the valve apart and either purchasing more parts or starting over from scratch... This isn't a question of what kind of sealant to use... He needs an un-sealer...

I honestly don't think I misread the original post...
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Last edited by rad14701 on Wed Apr 18, 2007 7:40 pm, edited 1 time in total.

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Unread postAuthor: TwitchTheAussie » Wed Apr 18, 2007 6:47 pm

Welding or solder? And as for the author just jbweld it or there is the alternative of starting over.
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Unread postAuthor: Fnord » Wed Apr 18, 2007 6:53 pm

teflon tape.


Its not two fittings I need to seal, its part of an adaptor I cut from a broken propane torch. I would have just bought a proper adaptor with fittings, but NOT ONE FRIGGIN store I went to had them. I even tried several welding supply stores.
Just my luck I guess :?
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Unread postAuthor: MisterSteve124 » Wed Apr 18, 2007 7:07 pm


Knock knock people... The problem here is that Author already glued the whole valve together and the piston leaks at the barrel seat... He doesn't need JB-Weld or epoxy... His question is more along the lines of whether there is a way to un-glue the PVC joints so he can get to the piston... He wants to know if there is a fix without cutting the valve apart and either purchasing more parts or starting over from scratch... This isn't a question of what kind of sealant to use... He needs an un-sealer...

I honestly don't think I misread the original post...



Um kock knock everyone is saying to put epoxy/jb weld over the glued fitting to seal it so there are no leaks so nobody is reading it wrong. And how the heck did you glue it with pvc cement and it still leaks? I find it really hard to beleive that you used pvc cement and it leaks.
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Re: PVC Welding screwup!

Unread postAuthor: rad14701 » Wed Apr 18, 2007 7:25 pm

pyro6314 wrote:Unfortunately I just finished my new Golf Ball Cannon and my shaved bushing I made for the front of my barrel sealing piston valve leaks badly after it was glued. Any suggestions for a fix other than hacking it apart or starting over :evil:


I really don't think I'm reading this wrong...

my shaved bushing I made for the front of my barrel sealing piston valve leaks badly after it was glued

This kinda tells me that he can't get to the leaking piston, inside the fully glued valve... Now, pyro6314, if I'm wrong just say so - but from the way I read it, I'm not... The way I'm reading it is that the piston seat isn't sealing at the barrel... Remember, the photo attachment was taken before the problem arose...
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Last edited by rad14701 on Wed Apr 18, 2007 7:40 pm, edited 1 time in total.

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Unread postAuthor: keep_it_real » Wed Apr 18, 2007 7:30 pm

(It doesn't look like the bushing is all the way in there. I also don't see any primer. Did you use any primer (clear primer maybe). )
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This is crap.

If you can, put glue over the leak and then make a vacuum. Otherwise just put epoxy, silicon, or jb weld over the leak and maybe some duct tape to hold the glue there.

edit- rad14701: he says

my shaved bushing I made for the front of my barrel sealing piston valve leaks badly


wouldn't that imply that the bushing is leaking, not the piston against the barrel
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Last edited by keep_it_real on Wed Apr 18, 2007 8:01 pm, edited 2 times in total.

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Unread postAuthor: hi » Wed Apr 18, 2007 7:32 pm

i dont know why i didnt think of this before, put glue on the inside, that will help seal alot better.
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Unread postAuthor: spudthug » Wed Apr 18, 2007 7:38 pm

It doesn't look like the bushing is all the way in there. I also don't see any primer. Did you use any primer (clear primer maybe).


the pics shows it not assembled..dur...

Obviously not glued yet here.
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4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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