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Largest Piston Valve

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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Largest Piston Valve

Unread postAuthor: Gepard » Sun Aug 19, 2007 5:07 pm

Hi,

What's the largest piston valve ever made? We're talking about it over on UKSGC and Ragnorak (Jo's brother) said it was 3" (we're talking about the porting not the actual piston diameter) but I can't help but think it sounds a little small for the 'largest ever'....

Anyone remember a larger one?
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Unread postAuthor: benstern » Sun Aug 19, 2007 5:12 pm

I believe a 4" piston valve exists.
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Unread postAuthor: DYI » Sun Aug 19, 2007 5:38 pm

I don't know about the largest ever, but I know that 3" barrel porting is the largest that is commonly used. A piston with 4" barrel porting would have to be built in a 6" tee, which is rather impractical. It probably has been done by someone though.
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Unread postAuthor: Velocity » Sun Aug 19, 2007 9:32 pm

If we are talking tee valves, it is probably 3"... Coaxials, on the other hand, have probably been made with 4" porting.
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Unread postAuthor: noname » Sun Aug 19, 2007 9:56 pm

Anyone want to be the first to make an 6 incher? I'll give you 8" PVC for $2.50 a foot, but I'm not paying shipping on it.
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Unread postAuthor: Gepard » Mon Aug 20, 2007 7:15 am

Hmmmm very tempted now to try and make a 4" just for bragging rights :D

noname,

Deal providing you pay for the fittings
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Unread postAuthor: jackssmirkingrevenge » Mon Aug 20, 2007 7:34 am

Not strictly an amateur creation but one of these perhaps?
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Unread postAuthor: Hotwired » Mon Aug 20, 2007 8:37 am

Mmm...

When something costs around $200,000, uses 3000psi air and chucks HE shells 5km you can be fairly sure it ain't amateur :wink:
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Unread postAuthor: noname » Mon Aug 20, 2007 8:45 pm

I have 8" PVC. That's it.
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Unread postAuthor: clide » Mon Aug 20, 2007 10:16 pm

Largest homemade valve I have seen is a 4" coaxial
http://www.spudfiles.com/forums/pumpkin-cannon-t74.html

The largest commercial valve I have seen is some 6" grain silo air cannons. They are used to clear clogs and there is also a pumpkin chunker that uses 4 of them, although I'm not sure if the pumpkin chunker uses the 6" valves, it does use this brand.
http://www.martin-eng.com/products.php?product=140
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