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blow gun vs ball 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: LovableAirGuns » Mon Nov 29, 2010 7:31 pm

here are the pictures in better quality
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Unread postAuthor: Technician1002 » Mon Nov 29, 2010 8:10 pm

Adding an o ring to the back of the piston can fix the excessive leakage into the pilot.

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Unread postAuthor: LovableAirGuns » Mon Nov 29, 2010 8:12 pm

would i still have to make an equalization hole?
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Unread postAuthor: Technician1002 » Mon Nov 29, 2010 8:38 pm

You will need some EQ. I found a 1/16th inch or smaller works very well. Drill in the side and angle past the o ring to the pilot.

I fill from the chamber in the Mouse Musket, Dragon, and Golf ball bazooka.

Sometimes a shot of air in the pilot is needed to close and seat the valve. After that rapid fill into the chamber is possible.

Pilot and fill on my golf ball cannon;
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Unread postAuthor: LovableAirGuns » Mon Nov 29, 2010 9:06 pm

aright sick thanks i might do that when i get back from my little holiday :D
nice gun to.
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Unread postAuthor: Technician1002 » Mon Nov 29, 2010 9:09 pm

I have not posted much on that one because it is all thinwall pipe. It is a low pressure toy and nothing else. It only runs on 30-50 PSI.
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Unread postAuthor: LovableAirGuns » Mon Nov 29, 2010 9:32 pm

fair enough still would be good to much around with :D
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Unread postAuthor: jackssmirkingrevenge » Mon Nov 29, 2010 11:14 pm

Technician1002 wrote:Adding an o ring to the back of the piston can fix the excessive leakage into the pilot.


Looking at the pictures, it looks more like the seat diameter is very close to the piston.

Can you give us x and y?
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Unread postAuthor: Technician1002 » Tue Nov 30, 2010 3:09 am

It is very close.. I like narrow ratio pistons.. :) They don't need a big pilot to get them to snap open. The bolt is almost the same size as the orifice. :D

Look at the seat diameter in the Mouse Musket. The seat is 1/8th inch from the OD.

The dragon was even a tighter ratio. Piston OD 3 inch. Seat seal diameter 2.8 inches. The pilot had to be bled down to almost nothing before it popped.

When it popped, it was POW. :shock:

Unfortunately the 2.5 inch pipe cap I used for a piston didn't last long.
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Unread postAuthor: LovableAirGuns » Sun Dec 05, 2010 4:16 am

just modified my blow gun and still wont pilot my piston :(
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Unread postAuthor: jackssmirkingrevenge » Sun Dec 05, 2010 4:18 am

Try wrapping tape around the piston until it's tight enough that you can barely move it with one finger.
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Unread postAuthor: LovableAirGuns » Sun Dec 05, 2010 4:38 am

would I still need to make a EQ hole?
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Unread postAuthor: jackssmirkingrevenge » Sun Dec 05, 2010 4:45 am

unless you have o-rings there's never need for an equalisation hole.
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Unread postAuthor: wyz2285 » Sun Dec 05, 2010 6:23 am

LovableAirGuns wrote:just modified my blow gun and still wont pilot my piston :(
i have a video about how to make a qev and there shows a nice and simple way to build a sensitive piston :)
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Unread postAuthor: LovableAirGuns » Sun Dec 05, 2010 7:43 am

can u send me a link please.
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