CO2 pressure relief valve for aquaristic purposes: with two pressure gauges and precision adjusting valve. This fitting is necessary, if carbon dioxide is taken from a pressure tank. The vapor pressure of carbon dioxid is about 60 bar and is reduced by the relief valve to 1-2 bars. The needed CO2 volume is adjusted with the precision adjusting valve. - Because the carbon dioxid is fluid the tank pressure will not fall the first time; not before the CO2 is nearly finished the tank pressure will fall.
CO2 is used for chalk reactors (lime reactors) and carbon dioxid reactors.