SpudFiles

I have already made 2 pneumatics with success and now I'd like to try a pneumatic.

I'm somewhat new to these forums so I might not know all the terms that well.

I want to make a pneumatic, reload action, as shown in this diagram:
(I spent a lot of time on the diagram - hopefully it makes sense) P.S. It doesn't load right in the thumbnail, you have to click it. Sorry about that.



If you don't know what I mean by reload action, go down and read "Reload action"

I am worried that I might not have the same pressure every shot. How can I avoid this, hopefully using this same basic design?

Thanks for all your help.

RELOAD ACTION

Phase 0 - Ball valve, handle valve are closed, projectile in barrel.
phase 1 - Handle valve opened, releasing pressure from main pressure chamber into secondary pressure chamber.
Phase 2 - Handle valve closes.
Phase 3 - Ball valve opened, letting pressure out behind projectile shooting it.

Uhh...a "handle valve" is just a different form of ball valve, and ball valves are pretty suck for pneumatics. You may want to consider using a sprinkler valve or QEV instead.

What's the purpose of two pressure chambers? Safety?

No, the point is that I could get more than one shot from a fully-loaded primary pressure chamber. Fill the secondary, close the first valve, open the second to shoot, close the second, open the first to refill, open second to shoot again.

so then use a sprinkler as the valve connected to the barrel and you can still achieve this

Interesting. The only problem I can see is that your pressure will decrease each shot since the volume is increasing. The workaround would be to charge the main chamber to a high pressure, and use a pressure regulator to step it down.

But with each repressurization of the secondary pressure chamber it won't have equal pressure each shot?

Thanks turbosuper. Damn same time posts!

You're welcome...damn not refreshing enough

If you really want multiple shots, and you aren't willing to use an air compressor or HPA, etc. I would suggest a backpack with as big an air reservoir as you can fit. This gun must be small caliber, or it will simply use too much air. I would think .50 would be the biggest practical bore, as the chamber must be relatively small for many shots. *looks at what he wrote* Man, that's confusing, huh?

The pressure WILL drop each shot. But there are ways for not having that.

You can use an high-pressure tank (way higher pressure then your gun will operate at) and a regulator to get the same power each shot.
This would proably call for a metal primairy chamber.
Or, just use a CO2 tank.

The handle valve IS a ball valve. It just has a different handle.

But do not use ball valves as valve, rather use a modded sprinkler. An easy way to get such a sprinkler, is to order one from http://www.bcarms.com

psycix wrote:The pressure WILL drop each shot. But there are ways for not having that.

You can use an high-pressure tank (way higher pressure then your gun will operate at) and a regulator to get the same power each shot.
This would proably call for a metal primairy chamber.
Or, just use a CO2 tank.

The handle valve IS a ball valve. It just has a different handle.

But do not use ball valves as valve, rather use a modded sprinkler. An easy way to get such a sprinkler, is to order one from http://www.bcarms.com

That has been already established, thanks. Almost word-for-word.

TurboSuper wrote:Interesting. The only problem I can see is that your pressure will decrease each shot since the volume is increasing. The workaround would be to charge the main chamber to a high pressure, and use a pressure regulator to step it down.

sandman wrote:so then use a sprinkler as the valve connected to the barrel and you can still achieve this