Beverage Carbonator Product

Overview

A carbonator dissolves carbon dioxide into water or finished beverage and holds it dissolved until the moment of dispense or filling. The same principle scales from the shoebox unit under a fast-food soda fountain to the saturator skid feeding a 60,000 L/h bottling line: chill the water, pressurize it with CO2, give the gas surface area and time to dissolve, and never let pressure or temperature stray from the curve that keeps it in solution.

The governing physics is Henry's law — dissolved CO2 is proportional to the partial pressure of CO2 above the liquid — and its strong temperature dependence: water at 2 °C holds roughly twice the CO2 of water at 20 °C at the same pressure. Every design decision in the machine serves those two facts. A cola is carbonated to roughly 7.5–8 g/L (about 4 volumes), sparkling water typically 6–8 g/L, and a lightly sparkling beverage 3–4 g/L.

How it works

Mains water first passes the Inlet Strainer and enters the Carbonator Pump. The Rotary Vane Pump Head is a positive-displacement head that lifts the water to 8–12 bar — well above the tank's 3–6 bar headspace — so it can be sprayed in against pressure; its Pump Bypass Valve recirculates flow when the outlet deadheads. The Pump Motor cycles on demand from the level system, often thousands of starts per week in a busy outlet.

Inside the Carbonation Tank, the Water Spray Nozzle atomizes the incoming water through the CO2-filled headspace. Droplets present enormous surface area, so most of the dissolution happens during that fall; the remainder occurs at the liquid surface while the water sits under pressure. Production machines add an inline CO2 Injector — a venturi or sintered sparger in the CO2 Injection System — that shears gas into sub-millimetre bubbles in the flowing stream, with the CO2 Flow Meter closing the loop on grams-per-litre dosing. Gas arrives from cylinders or a bulk tank through the CO2 Pressure Regulator, the CO2 Inline Filter, and the CO2 Solenoid Valve.

Cold water is non-negotiable. The Chilled Water System holds the water at 1–4 °C, usually via an ice bank: the Refrigerant Compressor freezes a reserve of ice on the Evaporator / Ice Bank coil during quiet periods, and the Bath Agitator Motor stirs the bath so peak dispense draws melt the ice instead of overloading the refrigeration. The Radiator condenser and its Blower Motor fan reject the heat. Warm carbonated water not only holds less gas — it foams violently at the dispense valve, which is the classic symptom of a failed ice bank.

Level control keeps the system stable. Three Conductive Level Probe electrodes feed the Level Control Board, which starts the pump at low level and stops it at high, maintaining a roughly constant headspace volume so tank pressure (and therefore carbonation) stays put. The Dry-Run Cutout locks the pump out on supply failure because a vane head run dry destroys itself in minutes. The Control Panel supervise the rest: holding the pressure–temperature pair that corresponds to the target CO2 level, and alarming on gas-out or low water.

Deaeration

Bottling-plant carbonators add a step the fountain unit skips: removing the air already dissolved in the water. Oxygen and nitrogen occupy "Henry's law capacity" that should belong to CO2, cause gushing at the filler, and oxidize flavors. In the Water Deaeration Stage stage, inlet water is sprayed through the Column Spray Head into the Stripping Column held at 0.1–0.3 bar absolute by the Deaeration Vacuum Pump; thin films of water release their dissolved air, which leaves through the Air Vent Valve. Good systems get residual oxygen below 0.5 ppm before a single gram of CO2 is spent.

Safety

Two hazards shape the regulations around carbonators. The first is pressure: the Pressure Shell is a certified pressure vessel and the Safety Relief Valve is its last line, set just above working pressure. The second is backflow. If carbonated water siphons backward into copper plumbing it dissolves copper and has caused documented poisonings at soda fountains — hence the dual Double Check Valve required by EN 13951 and NSF 18, and the rule that no copper may sit between carbonator and dispense point. CO2 itself asphyxiates: cellar installations pair the machine with gas monitors because a leaked cylinder can displace the air in a closed room.