| Filling method | Isobaric, CO2 counter-pressure |
| Capacity | 12,000-36,000 BPH at 0.2-2 L |
| Containers | PET bottle, glass bottle, aluminum can |
| CO2 handling | Pre-pressurisation and return pipe, no venting |
| Valves | Mechanical, semi-electric or volumetric |
| Line scope | Water treatment, syrup mixing, carbonation, filler, pack |
A carbonated drink is a saturated solution held in equilibrium by pressure and temperature. If the filler exposes it to atmosphere, CO2 leaves the liquid as foam and the fill level collapses. Isobaric filling pressurises the bottle to the bowl pressure first, fills under counter-pressure, then releases in a controlled ramp.
Four points decide it: the carbonation level set at the mixer, the product temperature at the filler, the pressure profile during fill, and the time between capping and packing. A line that holds 4.0 volumes at the mixer can deliver 3.4 in the bottle if the filler bowl runs warm or the capping head leaks.
| Valve type | Setting | Best for |
|---|---|---|
| Mechanical | Fixed cam profile | Single product, long runs |
| Semi-electric | Signal-timed open and close | Recipe changes within one product family |
| Volumetric | Chamber dose | Pressure or temperature drift during the shift |
| Isobaric + volumetric | Chamber dose under counter-pressure | High CO2 with tight fill accuracy |
Rated output, change parts and services are listed on the CSD & Sparkling Water by Mechanical Filler page.
Mechanical valves open and close on a fixed cam profile and are the most forgiving on maintenance. Semi-electric valves use a signal to open and close, so the fill window can be set per recipe. Volumetric valves dose a chamber and hold accuracy when bottle pressure or product temperature drifts during the shift.
The specification sheet for the Isobaric Filling Machine for CSD and Sparkling Water carries the utility figures quoted here.
Foam is usually a temperature or pressure problem, not a valve problem. Warm product, a fast pressure release at the end of fill, a worn seal that lets gas bypass, or a dirty return pipe all show up as foam at the same place. Check the product temperature and the pressure ramp before touching the valves.
The same question is worked through from another angle in How Nitrogen Dosers Preserve Flavor in Carbonated Beverages.
It holds what the mixer sets and the temperature allows. Most CSD runs between 2.5 and 4.0 volumes, with the target set per product. Retention, not the mixer set point, is what the acceptance test should measure in the filled bottle.
Usually product temperature rising in the bowl or a worn valve seal. Both change the pressure balance, so the fill cuts off earlier. Log bowl temperature and fill weight together for one shift before changing any valve.
It is used where the package needs internal pressure support or low oxygen, for example in cans and in some PET formats. It is an option, not a default, and it adds a consumable cost per 1,000 units.
Warm product and an empty bowl. The first bottles see the largest pressure step. A short recirculation before production and a controlled bowl cool-down remove most of it.
Country: Kazakhstan
Product: PET Bottled Carbonated Soft Drinks
Capacity: 12000BPH (1L)
Solution:Carbonated Drinks Production Line
Country: Syria
Product: Aluminum Canned Carbonated Soft Drinks
Capacity: 24000CPH (250ml)
Solution:Carbonated Drinks Production Line
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