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Idea for Butterfly 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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Idea for Butterfly valve

Unread postAuthor: us sniper » Wed Sep 12, 2007 8:23 pm

i have been thinking about his idea for a homemade valve. It would be easier than making a sprinkler valve. It could be triggered by a blow gun. I was also wondering if anyone knows how a sprinkler valve is triggered electronicaly. This is the valve: http://s153.photobucket.com/albums/s240 ... yvalve.jpg
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Unread postAuthor: homedepotpro » Wed Sep 12, 2007 8:30 pm

that seems like it would work if, you might have to have a bigger pilot. but that valve restricts flow more that a piston valve. the only upside i see is it is linear. you might need a return spring on it also.
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Last edited by homedepotpro on Wed Sep 12, 2007 8:31 pm, edited 1 time in total.
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Unread postAuthor: thespeedycicada » Wed Sep 12, 2007 8:31 pm

that might work but it will be a pain and a sprinkler valve is triggered electronically in essentially the same way its triggered with a blow gun.The solenoid lifts up opening the pilot and voila! an open valve.
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Unread postAuthor: us sniper » Wed Sep 12, 2007 8:52 pm

I do not think that I need a bigger pilot because once the air is gone in the space. After that air is gone the rest of the pressure will force the valve open. I don't think that I need a spring because as the air is pumped in the air will balance the valve and close it. I was also wondering if I could use a electromagnet, then it could be triggered electronically.
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Unread postAuthor: clide » Wed Sep 12, 2007 9:07 pm

That would be pretty hard to make. How do you plan on putting the pilot volume in there and sealing it? Also it would open pretty slowly and probably wouldn't end up opening all the way. Even if it did open all the way you would only get half the flow that the valve would normally have. You would be better off just building a piston valve. If you really wanted to use a butterfly valve you could actuate it with a pneumatic ram, thats what the pumpkin chunkers use.
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Unread postAuthor: us sniper » Wed Sep 12, 2007 9:25 pm

I don't want to build a piston because it isn't inline. It is half the size of a sprinkler valve, so half is acceptable, plus pressure may activate it fast.
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Unread postAuthor: singularity » Wed Sep 12, 2007 9:32 pm

a sprinkler valve is triggered when the solenoid is activated pulling a small metal piece off of a hole that leads out to the barrel. when the piece is lifted it allows the air above the diaphragm to be vented creating a pressure in balance forcing the diaphragm up allowing air to flow through the valve. the reason modified sprinkler valves work better is becuase the addition of a blowgun allows the air above the diaphragm to be vented faster than the solenoid could vent it meaning the diaphragm is opened faster, which always means better preformence.
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Unread postAuthor: Hubb » Wed Sep 12, 2007 10:11 pm

An inline piston valve can certainly be created. Check out trea's valve design. This is an idea that could work. Or what about the toolies valve. This can be modified into an inline piston valve.
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Unread postAuthor: Flying_Salt » Wed Sep 12, 2007 10:13 pm

Wait so does this spin or move back and forth? If its the latter, then you have a piston valve, but since you said butterfly valve, we'll assume its spinning.

You're going to need some sort of bumper, because it's gonna go pretty fast, so you need a spring or something, because a piston-type thing hitting a screw screwed in pvc is not a good thing, especially in a pneumatic.

I say go for it, it could work and all will remember us sniper as that one guy who made that one thing.
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Unread postAuthor: Hotwired » Wed Sep 12, 2007 10:24 pm

Maybe it'll fire something.

But mostly that blowgun will scoff a whole load of the chamber air as theres nothing to stop the chamber all going out that way when it opens.
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Unread postAuthor: jackssmirkingrevenge » Wed Sep 12, 2007 10:33 pm

Hotwired wrote:But mostly that blowgun will scoff a whole load of the chamber air as theres nothing to stop the chamber all going out that way when it opens.


Beat me to it, the performance certainly wouldn't be worth the complication of making it.
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Unread postAuthor: spud yeti » Thu Sep 13, 2007 12:23 am

I don't want to build a piston because it isn't inline

A coaxial is pretty much inline.

I think that if you have the time/money/willpower to experiment, go for it because it would be interesting; but if you want something that will work definitely, build a known-to-work valve like a piston.
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really good quote/phrase here
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Unread postAuthor: dongfang » Thu Sep 13, 2007 11:27 am

Hi,

What is a butterfly valve anyway? The kind used in throttle bodies?

Regards
Soren
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Unread postAuthor: Hubb » Thu Sep 13, 2007 5:15 pm

dongfang wrote:Hi,

What is a butterfly valve anyway? The kind used in throttle bodies?

Regards
Soren


A butterfly valve is similar to a ball valve, except it has a flat plate in it in place of the ball. They are easier to open (in my opinion) than a ball valve, thus giving a slightly better flow than a ball valve, but nothing that will be noticed. Yes, it is very similar to the throttle bodies.
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Unread postAuthor: dongfang » Thu Sep 13, 2007 6:12 pm

Hi,

Thanks for the explanation. Hmm, if the axis is placed slightly off center, they must be good for sear triggering?

Regards
Soren
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