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Best pilot 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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Best pilot valve

Unread postAuthor: clemsonguy1125 » Sun May 30, 2010 7:04 pm

For my 1 inch, 1/2 porting PVC piston valve sniper I was wondering what the best pilot valve would be, I considered these valves.
1. Sprinkler valve-way over kill
2. Ball valve- messes with aiming and I don't like using metal ball valves because of the price they are 10 bucks for a 1/4 or 1/2 inch valve, for there performace on a low pressure gun, there not worth it
3.Blowgun- seems kinda small but could work with a good piston
4.Hose spray gun- could mess with aiming and would be awkward
thanks for any help and opinions
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Unread postAuthor: Lockednloaded » Sun May 30, 2010 7:17 pm

it all depends on the valve, is the piston o-ringed, how much pilot volume do you have, and how heavy is the piston? even with a precision made piston i would not use a blowgun alone, a 1/4" BV would be much better, and any metal BV below 3/4" will not throw off your aim if you have a proper grip or a stock. a 3/4" SV could be a viable option, but it is overkill. i would use a small QEV/ homemade piston valve piloted by a blowgun to pilot your valve.
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Unread postAuthor: Technician1002 » Sun May 30, 2010 7:23 pm

Blowgun on small pistons work fine. A very short hiss followed by the boom.

Take a listen. My retired 1inch coaxial the Mouse Musket. You can download a zip of the MP3 from this page.
http://www.spudfiles.com/forums/another-piston-question-t21087.html
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Unread postAuthor: Gun Freak » Sun May 30, 2010 7:27 pm

I would make a check valve piston, mod the crap out of a blowgun, modded blowguns can get better flow than a 1/4 ball valve (quoted from Hubb Library) and my 2" piston valve can pilot off the 1/4 BV that is used for filling. I say go with a blowgun. Is it a compact valve or not? I think you're sick of compacts, but the blowgun should be plenty for this valve.
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Unread postAuthor: clemsonguy1125 » Sun May 30, 2010 7:30 pm

The pison will not be oringed, i don't get abot the equilization hole, I know why it's there but would I cut a grove along the edge of the piston, the pistons a half inch end cap which will slide in thinwall 1 inch pipe
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Unread postAuthor: Gun Freak » Sun May 30, 2010 7:32 pm

Ok if it isn't o-ringed, the blowgun probably won't work, the chamber air will equilize the pilot air too fast and the valve won't open. Make a little piston valve pilot, or by a QEV, which I dont think you wanna do.
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Unread postAuthor: clemsonguy1125 » Sun May 30, 2010 7:34 pm

Ok I may have to oring it, I don't want a qev, I may put felt on the piston which actually works great
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Unread postAuthor: Gun Freak » Sun May 30, 2010 7:35 pm

Well the felt is useless if you have o-rings, it will just make friction and the valve will open slower.
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Unread postAuthor: clemsonguy1125 » Sun May 30, 2010 7:37 pm

Incorrect, it compresses and slows down the air equilizatin like fabric medical tape
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Unread postAuthor: Gun Freak » Sun May 30, 2010 7:39 pm

If you have o-rings and a check valve, there is no equilization.
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Unread postAuthor: clemsonguy1125 » Sun May 30, 2010 7:44 pm

I was talking about a non oringed piston, I'm not sure if I will be able to make that small of check valve
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Unread postAuthor: Gun Freak » Sun May 30, 2010 7:45 pm

Gun Freak wrote:Well the felt is useless if you have o-rings, it will just make friction and the valve will open slower.


I know that. You probably can't pilot a piston with felt instead of o-rings with a blowgun.

EDIT Replace Hubb's 1.25" fittings in his design with half inch, and your done.
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Unread postAuthor: clemsonguy1125 » Sun May 30, 2010 7:54 pm

Yeah, but I'd have to find small rubber washers or cut my own but I'll probably do that
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Unread postAuthor: Gun Freak » Sun May 30, 2010 7:55 pm

The check valve eliminates the need for an equilization hole. The filling air can pass it, but not get back, That's the point.
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Unread postAuthor: clemsonguy1125 » Sun May 30, 2010 7:59 pm

But if i dont build a check valve
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