I have a CO2 production for my aquariums (currently 2, but the solution should be extenable to - let's say - 5) based on fermentation of bio mass (CO2 is used as fertilizer there) which consist of a bottle, a connector, valves and diffusors and flippers which help dissolving the CO2 underwater. They're connected with 4/6mm tubes.
Since the efficiency of the fermentation is irregular the presure in the system varies. Extranous CO2 is released into the water, but can't be dissolved and thus is waisted.
I want to avoid that by adding a storage which collects CO2 if the pressure in the system is above 2 bar and releases it when it's below. What components can I use for such a system?
CO2 source -->--|-- valve 1 -- Aquarium 1 (diffusor, underwater) | |-- valve 2 -- Aquarium 2 (diffusor, underwater) | |-- ... | |-- storage
Functional sketch of my idea for a storage:
|---------| -->- backstop valve opening > 2 bar before storage ---- Storage ---- pressure regulator opening < 2 bar after the storage -- |---------|
The storage isn't necessary in the scenario since the CO2 is cheap and over-pressure could easily be released in the room (1 1.5 l PET bottle with water and sugar can't cause a hazard). It's more of an engineering exercise.