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Dual Valves

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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Dual Valves

Unread postAuthor: ShowNoMercy » Mon Nov 12, 2007 11:01 pm

I have two sprinkler valves sitting around and I have a large section of both 2" PVC and 3/4" CPVC, so my plan is to make a chamber out of the two inch stuff and then with a cross have dual sprinkler valves connect to a paintball barrel above. Any ideas on whether the dual setup will net me any performance over a single valve?
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Unread postAuthor: BC Pneumatics » Mon Nov 12, 2007 11:04 pm

GGDT it and see? There is an input for number of valves.
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Unread postAuthor: ShowNoMercy » Mon Nov 12, 2007 11:08 pm

GGDT doesn't work on my computor, don't know why but I would have done that. So I was just putting it out there. [/i]
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Unread postAuthor: hi » Mon Nov 12, 2007 11:11 pm

according to my ggdt, yes it will, you will get a whole 10 fps increase!!! i say go for it.
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Unread postAuthor: ShowNoMercy » Mon Nov 12, 2007 11:13 pm

10 fps increase?? Oh man I am so going for it now. Now the tricky part will be finding a 2 inch cross.
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Unread postAuthor: EGOed » Mon Nov 12, 2007 11:14 pm

Your flow rate will already be restricted by your 3/4 " barrel porting so you wont be able to dump the chamber any faster by using 2 valves instead of one assuming they are 1" sprinkler valves.....Probably not worth wasting an extra valve for this setup.....Do this on a larger cannon.
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Unread postAuthor: ShowNoMercy » Mon Nov 12, 2007 11:16 pm

Yes they are 1" valves and I am at the point where I gonna pull the American style of building and since it cant hurt performance I am going to go ahead with it.
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Unread postAuthor: EGOed » Mon Nov 12, 2007 11:22 pm

Well it wont hurt since you already have the valves , give it a go.... It will look impressive Im sure.
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Unread postAuthor: jackssmirkingrevenge » Tue Nov 13, 2007 12:02 am

ShowNoMercy wrote:Yes they are 1" valves and I am at the point where I gonna pull the American style of building and since it cant hurt performance I am going to go ahead with it.


With a 1" valve on a 3/4" barrel I really doubt two valves will shoot any faster, as presumably with a 1" valve you already have maximum flow for your barrel diameter - but I understand, you're American, go ahead :)
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Unread postAuthor: EGOed » Tue Nov 13, 2007 12:27 am

I agree with Jack on this ......The second valve would be better utilized if you incorporate it into a double or multiple barrel design...I have made manifolds using five 3/4" barrels and fire 75 paintballs a shot by loading 15 balls in each barrel...Very intimidating on a paintball field to say the least.
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Unread postAuthor: hi » Tue Nov 13, 2007 1:17 am

but just think about how much more it hurts to have a paintball hit you at a full 10 feet per second faster...
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Unread postAuthor: jackssmirkingrevenge » Tue Nov 13, 2007 1:36 am

For an energy gain of about 0.25 ft/lbs, hardly worth the effort...
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Unread postAuthor: EGOed » Tue Nov 13, 2007 1:41 am

Well , I dont think I would want to be hit with a paintball shot from either one of the two cannons.....Getting hit with one @300 feet per second hurts and leaves a mark.......500 feet per second leaves a hole......I still think I would rather get hit with 1 than 75 though....the lesser of 2 evils.
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Unread postAuthor: Hubb » Tue Nov 13, 2007 2:35 am

If an extra sprinkler valve will provide about 10fps extra to the shot, and piston valves are better, how much performance would be gained from two piston valves on the same launcher, provided they are synchronized?

Say, 1.5" piston with the same setup.
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Unread postAuthor: jackssmirkingrevenge » Tue Nov 13, 2007 2:56 am

10 fps extra over a velocity of say 500 feet per second is only a 2% increase in velocity and 4% increase in muzzle energy, so it really isn't that dramatic.

how much performance would be gained from two piston valves on the same launcher, provided they are synchronized?


Increasing the flow more than the flow of a 3/4" barrel will have no benefit - what you need is faster opening time. Technically, using 2 valves means you're doubling the rate of flow increase, but in practive using a small fast opening piston valve is a better and easier idea than using two large ones.
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