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Would this valve design work?

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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Would this valve design work?

Unread postAuthor: sco77 » Thu Aug 04, 2011 4:57 pm

I have some misc spare parts (fully threaded brass tube, pipe nipple, 1/2" > 1/8" reducer, schrader) and was thinking about piecing together a small caliper BB cannon from them.

I was wondering if this design for a valve would work or would the suction from the barrel not allow the valve to open long enough or fast enough? I realize if it did work loading the barrel would be tricky.
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Unread postAuthor: Mr.Tallahassee » Thu Aug 04, 2011 5:01 pm

This is a generic coaxial design. Of course it will work. I would put a blowgun where the schrader is and put a 1/4'' schrader adapter in the end of the blow gun without the core. It's easy to fill and gets better flow. You would have to hold it open to fill it and shut it before you remove the air supply.
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coaxial1.JPG
Simple as this. (CORRECTED)
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Last edited by Mr.Tallahassee on Thu Aug 04, 2011 10:27 pm, edited 1 time in total.
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Unread postAuthor: jackssmirkingrevenge » Thu Aug 04, 2011 9:26 pm

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Unread postAuthor: Gun Freak » Thu Aug 04, 2011 9:32 pm

If you're gonna steal a JSR design, put the blowgun in the right direction :lol:
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Unread postAuthor: Mr.Tallahassee » Thu Aug 04, 2011 10:23 pm

Crap! :lol: Let me edit that. I didn't re-save the pic. Although the blowgun will work either way.
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Unread postAuthor: Gun Freak » Thu Aug 04, 2011 10:30 pm

It would work, but only at low pressure. When the valve is installed the correct way, air forces it closed. When it is backwards, air forces it open, only against the tension of the spring, which is not very strong. And the blowgun is more ergonomic when installed the correct way in this instance.

I was wondering if this design for a valve would work or would the suction from the barrel not allow the valve to open long enough or fast enough?

There is no suction in a piston valve.

I realize if it did work loading the barrel would be tricky.

Difficult loading comes with any coax :wink:
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Unread postAuthor: Technician1002 » Fri Aug 05, 2011 12:46 am

See the Mouse Musket in my sig for a functional build of that basic design. Yes it works. The hard part is the build quality so the piston does not leak too much and does not have too much blow by between the pilot area and the chamber area.

Three common problems people have are

The piston won't seal on the barrel due to surface imperfections preventing an air tight seal,

The piston has too much leakage past it so opening the pilot valve (blowgun) the air escapes out the pilot instead of moving the piston,

the piston fits too tight so it doesn't fire. Use care and make sure the piston barrel seal is good and the piston has very little leakage past it, and it moves freely without sticking.

Use a bumper so when it does pop open, it does not hammer it's way out the back.
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Unread postAuthor: jackssmirkingrevenge » Fri Aug 05, 2011 1:02 am

;)
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Unread postAuthor: sco77 » Fri Aug 05, 2011 1:40 am

I put it together and as previously posted there wasn't enough pilot flow with schrader, when I removed the core it worked great so a blowgun design might be good... Right now the piston is just a perfect tight fit and I have the pilot area lubed up, I used dremel to make a groove in piston for barrel seat, it seals excellent.
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Unread postAuthor: jackssmirkingrevenge » Fri Aug 05, 2011 1:55 am

sco77 wrote:there wasn't enough pilot flow with schrader


the piston is just a perfect tight fit


Image

I could pilot a 2" valve with a schrader...
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