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Why mod a Sprinkler 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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Unread postAuthor: windshrike » Sat Nov 24, 2007 10:00 pm

There is air on both sides of the diaphragm(the rubber disk thingy); one side of the air is the side of the main chambers air and is fairly large. The other side is called the pilot and is fairly small. When the pilot is vented, the diaphragm moves, allowing the main chamber of air to release into the barrel. The blowgun releases air when the trigger on it is pulled, and this vents the pilot.
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Last edited by windshrike on Sat Nov 24, 2007 10:14 pm, edited 2 times in total.
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Unread postAuthor: TurboSuper » Sat Nov 24, 2007 10:12 pm

Of course, it's just a close nipple and a blowgun, should be available at any hardware store.

Just go up and ask: "Where do you keep the nipples?" :D
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Unread postAuthor: grumpy » Sat Nov 24, 2007 10:13 pm

yes, lowes or home depo will have what you need.
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Unread postAuthor: MrCrowley » Sat Nov 24, 2007 10:47 pm

BrodMan wrote:i dont get how squeezing the blow gun opens the valve.


When the trigger is squeezed it opens the valve, I wont go into detail, because you don't really need to know at the moment.

But when the trigger is squeezed, the valve opens, lets air out, opens the diaphragm(valve) and lets all the air out the barrel.
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Unread postAuthor: psycix » Sun Nov 25, 2007 3:40 pm

BrodMan wrote:could i find the parts i need to mod it at lowes? i watched a video spudfiles put on youtube, but i dont get how squeezing the blow gun opens the valve.

Squeezing the blow gun will empty the pilot area of the sprinkler.
This means air moves out and the pilot side of the diaphragm gets lower pressure then the other side, pusing the diaphragm upwards.
This opens the valve.
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Unread postAuthor: BrodMan » Mon Nov 26, 2007 7:05 am

i get it now. how much would it cost to buy, and mod a sprinkler?
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Unread postAuthor: jackssmirkingrevenge » Mon Nov 26, 2007 7:08 am

As already explained, you can get them premodded for next to nothing ;)
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Unread postAuthor: jimmy101 » Mon Nov 26, 2007 12:45 pm

It'll probably cost about $10 to mod a sprinkler. You need the blowgun and the correct fitting.

Based on the research ssb73q did (links to the posts on the old spudtech archive have been posted earlier in this thread), a mod'd valve will increase the muzzle velocity by a lot, perhaps 1.5 to 2.x compared to the stock valve. That works out to 2~4 times as much kinetic energy in the round.
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Unread postAuthor: BrodMan » Mon Nov 26, 2007 5:21 pm

nice. i drew up plans today at school, and got in trouble for drawing when she was giving us notes, so i will try to draw it on paint or something, and post it here soon.
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