Pressure Regulating And Timing A DIY Yeast CO2 System

This is the first time I have posted on a forum so if I make a mess please go easy on me.
A few years ago I created a pressure regulator for a yeast CO2 generator that has been working well so I wondered if anybody else might want to make use of it. I created a pdf that describes it, the principle is very simple but to the best of my knowledge this is a novel idea. I have shown the theory behind it and included some of my weird humour which you can choose to ignore but it is a tried and tested fully working design. So please have a go and let me know if it worked for you.
Regards,
Andy the minion

Instruction on how to make the regulator
http://www.thinkfish.co.uk/forums/fish-tank-plant-advice/making-the-co2-regulator/

Oct 2017 The regulator build Mk2 (Carlos Fandango version)
https://forums.thinkfish.co.uk/fish-tank-plant-advice/pressure-regulating-a-diy-co2-system/

June 2018 Comments on the operation of the Mk2
https://forums.thinkfish.co.uk/fish-tank-plant-advice/yeast-co2-optimum-mixture/msg40757/#msg40757

Hello, and welcome. Nifty pressure regulator - Ilike it!

That's a great design and really well presented. Thanks for sharing! 

I'd be interested in seeing photos of the real-life working system ...

I use a cup of sugar, a tea spoon of yeast and a tea spoon of bicarbonate of soda to buffer the solution and prevent the acidity rising too quickly and killing the yeast.
The bottles I use are 3 litre and I fill them to within about 5cm of the top.
Try starting the yeast in 1/4 of a cup of warm water and a bit of sugar then whisked to activate the yeast.
I also de-chlorinate the bulk water (also warm) for the same reason we would for bio filters. These last over two weeks but I normally run them as a pair changing one each week.
Give the bottles a shake every day or so then the yeast doesn't just form a goo at the bottom.
When I refresh a mixture I always empty and completely fill with warm water and a good strong chlorine solution and let them stand for 10 min to kill any bugs - then of course give them a really thorough rinsing before refilling. I wrap ptfe tape around the tread for a nice gas tight seal.

I have recently done a major rebuild on my yeast CO2 system and have written up the process if anybody is interested.
It is now working with the light timer and is switching off overnight automatically, still regulating CO2 pressure and storing gas, but there is also a new higher efficiency CO2 reactor in the build notes... and pictures.