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Two valves one trigger

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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Two valves one trigger

Unread postAuthor: Lockednloaded » Wed Aug 22, 2012 9:38 pm

I'm about to start working on a double-barreled double-valved gun. I want the barrels to fire independently, but I only want one trigger. It'll be hooked up to constant air so I want the gun to fire every time I pull the trigger, with the complicated twist that it has to alternate firing between the two valves.

I'd like to stay away from electronics, but if its a necessity to make this design work I'll use them. Is there some sort of directional control valve I could use? Or a mechanical system?

I'm really drawing a blank on this one, anyone got any ideas?
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Unread postAuthor: POLAND_SPUD » Wed Aug 22, 2012 11:06 pm

Doable but not practical at all (a pneumatic flip flop circuit) - too many parts and that would be too expensive

there are other options too - a mechanical/manual 5 way valve + a simple mechanical detent/flip flop (well I think it basically functions as a flipflop in a way) - essentially you need a mechanism you can find on retractable pens - you press the button once it extends, you press again and it retracts

Or just use electronics and a bistable 5 way solenoid valve or two seperate 3 way solenoid valves

EDIT
ohh and here is a link to a flip flop valve/cirucuit >>>
http://www.kuhnkeusa.com/pdf/pneumatica ... p_flop.pdf
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Last edited by POLAND_SPUD on Thu Aug 23, 2012 6:43 am, edited 1 time in total.
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Unread postAuthor: PVC Arsenal 17 » Wed Aug 22, 2012 11:07 pm

A two stage trigger would be fairly easy to build but you must discipline yourself to only pull a certain amount for the first shot.

I'll check into some other things... there has to be a more elegant solution. Maybe shuttle valves?

Edit:

Perhaps you could modify or build your own spring biased shuttle valve?


Image

Imagine your trigger connected to port A, your pilot for barrel 1 connected to Y, and your pilot for barrel 2 connected to X. By adding a biasing spring so that A and Y are normally connected and X is closed, and assuming that both X and Y are pressurized: Pulling the trigger will cause barrel 1 (Y) to fire. Then, now that a pressure difference will be present, the biasing spring is overcome and X and A are connected while Y is closed. Pulling the trigger again fires barrel 2 (X).

This makes sense to me in my delirious, sleep-deprived state but I welcome POLAND_SPUD to criticize. And of course the execution will be far more difficult than my description makes it seem.
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Unread postAuthor: POLAND_SPUD » Wed Aug 22, 2012 11:19 pm

Maybe shuttle valves?
shuttle valves would be used for two triggers controlling one valve

Seriously been thinking about this and you need some sort of flip flop - even if you suggest something that I didn't think about it probably will be a flip flop anyway

Personaly I think that the mechanical flip flop + 5 way valve is the most elegant solution to this

EDIT
The idea you posted will fire both barrels in a sequence with one press of the trigger

damn typos
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Unread postAuthor: PVC Arsenal 17 » Wed Aug 22, 2012 11:30 pm

POLAND_SPUD wrote:
Maybe shuttle valves?
shuttle valves would be used for two triggers controlling one valve

Seriously been thinking about this and you need some sort of flip flop - even if you suggest something that I didn't think about it probably will be a flip flop anyway

Personaly I think that the mechanical flip flop + 5 way valve is the most elegant solution to this

EDIT
The idea you posted will fire both barrels in a sequence with one press of the trigger

damn typos


Dammit I knew it seemed too good to be true :oops:

Off to bed I go...

But first one final suggestion: just add in a selector switch and call it a day.
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Unread postAuthor: jackssmirkingrevenge » Thu Aug 23, 2012 12:14 am

No shame in having two triggers...

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