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How do I fit a schrader valve to a Plastic bottle

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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How do I fit a schrader valve to a Plastic bottle

Unread postAuthor: Sam Christy » Sat Apr 14, 2007 3:40 am

Bassically I'm new to these forums (first post : :roll: )

I have made a cannon out of 15mm pvc connected directly to a ball valve with a 15 to 22 converter which fits quite snugly on the inside of the 500ml drinks bottle. I can fit everything together perfectly air tight except for the schrader valve (which i cut from my dad's bike's inner tube 8). I have tried gluing it with super glue and pvc glue and it doesen't work.

I would really appriacate it if someone could share with me any tricks on how to fix it or where i can get specail easy fit valves.

In advance thankyou (sorry for spelling 14 year old dyslecsic)
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Unread postAuthor: Mr.Russ » Sat Apr 14, 2007 3:54 am

drill a hole in the bottom of the bottle(12.5mm hole) and then push it in through there.

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Unread postAuthor: jackssmirkingrevenge » Sat Apr 14, 2007 3:54 am

Hi and welcome to the forum.

Have you tried this stuff?

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works great for me :)
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Unread postAuthor: Sam Christy » Sat Apr 14, 2007 4:38 am

no but have with similar products do you have any pictures of how you did it?
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Unread postAuthor: jackssmirkingrevenge » Sat Apr 14, 2007 5:04 am

First you need to reduce the schrader to bare metal at the base (ie remove the rubber coating along the body), I find that an easy way of doing this is simple scraping off the rubber with a good blade then finish it off with rough sandpaper.

You should be left with something like the one illustrated in the pic attached.

Now all you need a 6mm hole in the base of the bottle you're using as a chamber and stick the schrader in with plenty of araldite, leaving it to set overnight. Be careful not to get any inside the bottom of the schrader as it may gum up the internal mechansim.
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Unread postAuthor: Sam Christy » Sat Apr 14, 2007 5:09 am

cheers mate will have to try have you got any pictures of a cannon you've made in this fashion?
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Unread postAuthor: jackssmirkingrevenge » Sat Apr 14, 2007 5:12 am

I use this method to attach schraders to all my projects, like this one and this too :wink:
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Unread postAuthor: Sam Christy » Sat Apr 14, 2007 5:26 am

thankyou so much i will go and buy some aldrite do they sell it in the uk?
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Unread postAuthor: jackssmirkingrevenge » Sat Apr 14, 2007 5:33 am

I would think so, it's a fairly common brand. If you don't find it any 5 minute epoxy will do really, this is just the brand i've got the best results from.
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Unread postAuthor: lukemc » Sat Apr 14, 2007 6:51 am

i used J B weld on my last shrader attatchment an it didnt work as well as you would think i had to keep adding it..maybe i did some thing wrong
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Unread postAuthor: Mr.Russ » Sat Apr 14, 2007 6:54 am

i dont get why everybody glues their valves in. you dont need to.

If you buy new ones, from a car tyre shop or somewhere similar, you drill a 12.5mm hole and it will go in. it will be hard to get in but it will not leak. at all.
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Unread postAuthor: pyromaniac » Sat Apr 14, 2007 9:45 am

Sam you're attatching it directly to the soda bottle right?

If so that may be why it leaks.

try putting your schrader in a tee with a pvc cap on the down end.

just drill a hole in the pvc cap and jam the schrader through. Then prime and cement it on.
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Unread postAuthor: SpudBlaster15 » Sat Apr 14, 2007 11:44 am

I have yet to find an adhesive that bonds exceptionally well to polyethylene soda bottles.

Epoxies, cyanoacrylate glues, silicone sealants, etc. will not adhere well, if at all.

A product I purchased for sealing almost any other surfaces; known as GOOP contact adhesive and sealant, had decent adhesion, though I am not sure it would grip the polyethylene bottle in a pressure application such as this.

Your best bet is, as pyromaniac suggested, to not install the schrader valve in the bottle, but rather a PVC component of the launcher. All of the sealants listed in my above 2 paragraphs adhere exceptionally well to PVC.
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Unread postAuthor: pyromaniac » Sat Apr 14, 2007 11:48 am

aren't soda bottles and scraders made of plastic so couldn't you just melt em together with a lighter. Although this seems very inpractical.
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Unread postAuthor: SpudBlaster15 » Sat Apr 14, 2007 12:14 pm

SpudBlaster15 wrote:I have yet to find an adhesive that bonds exceptionally well to polyethylene soda bottles.


I now retract this statement.

A little research on Google turned up this, an adhesive capable of structurally bonding polyethylene and polypropylene to themselves, as well as a variety of other materials.

Image

"Scotch-WeldTM DP-8005 is a solvent-free, two-part, acrylic-based, structural plastic adhesive designed to structurally bond polyolefins to themselves and to many other substrates. It uses a one-step process that requires no pre-treatment of the substrates other than removing dirt and oil. Like Polyolefins themselves, DP-8005 provides very good chemical resistance. Similar to most polypropylenes and polyethylenes, maximum continuous service temperature for DP-8005 should be kept under about 212ºF (100ºC)."
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