After having used the Citric Acid and Baking Soda setup for a few months now and playing around with various configurations and formulae I did quite a bit of research on the web and reading up on some amazing threads here and planned my Paintball CO2 setup. The first thing I wanted was to have two stages to reduce pressure from the cylinder and I wanted a high grade needle valve with a good pressure capacity to bring the pressure down first and then use a pneumatic flow control valve to do finer controls for the bubble rate. Here is what I came up with :
1) I got the ASA ON/OFF Valve from e-Bay for $ 11 which has a gauge and a 1/8" NPT threaded hole. It came all the way from China and to my surprise arrived in 6 days flat. The quality is very good and fits perfectly on my Empire 24 Oz tank that I got on Amazon for $ 25
2) I had my eyes on this Needle valve which handles upto 6000 PSI and I wanted to play it safe with the pressure from the cylinder. It has got 1/4" NPT male threads and I got this on Amazon for around $ 11.
3) I picked up an adapter for around $ 3 from Amazon to fit the 1/4" NPT needle valve to the 1/8" NPT thread of the ASA On/Off valve.
4) I wanted a flow control valve for fine tuning the bubble rate after the needle valve brings the pressure down to a more manageable level. I got this Pneumatic flow control valve on e-Bay for $ 7, again from China.This valve has 1/4" NPT female threads and will screw on directly to the needle valve.
5) I got a 1/4" to 1/4" NPT Male adapter to attach my solenoid valve to the flow control valve for $ 2.
6) The Solenoid valve was off e-bay for $ 14 and has 1/4" NPT female threads on both ends.
7) The final adapter is with 1/4" NPT Male threads that screws into the solenoid valve and the airline tubing starts here.
I do have a SS check valve ($5), a bubble counter ($5) and a ceramic diffuser($6) which I will reuse from my current setup.
I tried to make sure that all the threads were of the NPT standard so that it is easier to attach the various components to each other.
I am still waiting for the Pneumatic flow control valve to arrive from China before I can complete the assembly and test it. In the meanwhile all the other components attach to each other perfectly.
I will post more photos as I assemble this along with updates as I test and use this system. I hope this will help others who are thinking of going the paintball tank way.