Electric ball valve?

[Aurum]

Yeah, its called deionised water. easy enough to get a hold of, but not practical for water fights, as you would have to have it on hand (i.e. use this instead of your average water).
In this case you may have a slight upper hand with your first tank of deionised water, but after that it would take too long to get to a deionised source whilst everyone else refill's they're guns with water

Also, i dont think there are computers submerged in water. water cooling is one method, via having it circulating through pipes. But yeah there are some computers that have been modded to run submerged in oil (vegtable oil to be precise )

[Drenchenator]

Distilled, deionized, and pure all refer to the same thing, water without anything else in it making it just straight H20. It's in fact the minerals in water that let electric current pass through it, so I guess you could be safe with an electrically activated system provided that the water that you use is very pure or what's called soft water--water without many minerals. Hard water is water with a lot of minerals. You can tell the difference by taste.

[Aurum]

You know, youve just reminded me of something i was looking at on the web last week... some one had built a kind of Railgun which fired ionised water (not hard water, i mean charged water). Something silly like 20kV, and it could only fire like a vapour with a massive spread. Still, could break though paper at a range of 1", but by 3" it was basically spraying the whole page.

I cant remember how i found the page now, so no link im afraid

[aEx155]

I believe that the page is located in the "Homemades" section of this site, under the off-site links. I looked at it, and it doesn't seem very feasible at all.

Either that, or you're looking at something else.

[Aurum]

Im pretty sure you've hit the nail on the head there.

But your right, it needed high voltage for a measily sprinkle of water. Utterly useless

[Silence]

Distilled water would work, but it would have to stay distilled. But with tons of minerals and grit on pretty much every surface, the water would become electrically conductive immediately.

Good insulation should take care of water problems. Watercooled computers, for example, use tubing inside the case, which does take a good amount of care but can be safe. Here, electrical tape around all the wiring should work, and at any rate, water that enters would probably short the system but not cause lasting damage. Unless there are microcontroller boards or high voltages/amperages involved, there probably isn't much need for worry.

For example, solenoid sprinkler valves are electrically actuated to be used in irrigation systems. I presume electric ball valves are used in similar situations that call for higher flow.

[Drenchenator]

Distilled water would work, but it would have to stay distilled. But with tons of minerals and grit on pretty much every surface, the water would become electrically conductive immediately.

Didn't think of that. I assumed that using distilled water would be kinda stupid anyway, but that just makes it seem really pointless. If anyone electrically activates any valve, just do what SilentGuy said that insulate it well enough that water can't get to it.

[Ben]

This is somewhat related, given that we're all searching for an easy to use trigger actuated valve.

I was surfing the internet and found a reasonably small pull gate valve: http://www.flexpvc.com/cart/agora.cg...VC-Valves-Gate

If you want something easy to make trigger actuated this 1 inch gate valve should work. It looks pretty tall but I'm sure someone could design around it.

[Drenchenator]

Well, I suppose if you concoct the right trigger system, that would work well and actually get some pretty high flow. The only real problem I see if getting around the height, but it you just orient it in the right way it shouldn't be much of a problem.