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homemade valves 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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homemade valves leak...

Unread postAuthor: keep_it_real » Wed Jan 31, 2007 8:32 pm

So the valve you can see in the second picture leaks along with the two others inside. I used the zero semi auto valve idea from nerfhaven.com which probably wasn't a good idea. Or I should have tested it first somehow before gluing it together. I'll take it a little slower next time.

What should I do now though. I was thinking maybe I could use the stock but throw out the piece on front. The barrel and the hopper are threaded so I can use those again too. Maybe I should just use two sprinkler valves and a temporary chamber. I'm not familiar with sprinkler valves so I don't know how you reset them but it's a thought.

Any thoughts?
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pb gun 001.jpg
pb gun 002.jpg
Here is a sort of close up view of the valve.
pb gun 003.jpg
I didn't glue the whole gun togther and this is where it's split
Last edited by keep_it_real on Wed Jan 31, 2007 8:59 pm, edited 1 time in total.

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Unread postAuthor: judgment_arms » Wed Jan 31, 2007 8:48 pm

Yeah, I got a thought, post a link to the page were you got your valve plans.
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Unread postAuthor: keep_it_real » Wed Jan 31, 2007 9:00 pm

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Unread postAuthor: judgment_arms » Wed Jan 31, 2007 9:21 pm

Ok read the page, think I got it, where’s it leaking at? Take one of your pictures and label where the air’s going in and out, where the valve is, although I think I know, etc.
Oh and thanks that’s an interesting valve; think I may consider something like that for my paintball longarms, thanks.
Now you helped me, tell me what’s wrong, exactly were it leaks, etc.
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Unread postAuthor: keep_it_real » Wed Jan 31, 2007 9:33 pm

Air leaks out between the copper tubing and the CPVC endcap. I don't think they make the O-rings nerfhaven says you should use but I dunno. Anyway I got two different types of O-rings one with OD 7/16" x 1/4" ID to create the seal (that doesn't work) and another that was just a little bigger to fit inside the vinyl tubing. I just put both o-rings in there hoping the bigger one would hold the smaller one in place (make sense?).

I think it is a pretty good design except I'm not sure the holes in the copper tubing let air out fast enough.
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Unread postAuthor: judgment_arms » Wed Jan 31, 2007 9:53 pm

Hummm…can you take out the brass tube? If you can remove it and pick out the O-ring, then go and find the right one. Or if you’ve looked high and low and still can’t find one get a package of “gasket material”, it look’s red around these parts, you can get it at the home-cheapo, and I’ve seen ’em at the ACE. Well you’re at the hardware get another CPVC end cap as a pattern, cut enough disks so that stacked to gather they are at least as thick as the original O-ring preferably just a faction thicker. Now find the exact center of those disks and take a scrap of ¼” brass tubing and place a disk on a piece of scrap wood, center the piece of tubing and hit it with a hammer until you get a perfectly punched hole, repeat that until all the rubber disks are done, now stick those “gasket” disks in the slot the valve were the O-ring was, put the brass tubing back in and your done. No guarantees that it’ll work, I think it will but in case it doesn’t; now you can’t say I didn’t warn you.
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Unread postAuthor: VH_man » Thu Feb 01, 2007 11:14 pm

Ummm, i tried one of these once, they arent tha great. they leak like crazy, even if you follow his instructions EXACTLY. but hey, the next sixe up of Brass tubing fits airsoft bb's well, so i think i might make a bolt-action airsoft gun....... but anyway, go with a different semi-auto mechanism, or custom machine the whole thing. if you get it to work, tell me, but otherwise, dont even bother.
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Unread postAuthor: keep_it_real » Fri Feb 02, 2007 1:32 am

okey doke...

any semi valve suggestions? or links.
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