Isobaric (counter-pressure) bottling lines are designed specifically for carbonated products — beer, sparkling wine, Prosecco, carbonated soft drinks and sparkling water. Isobaric filling pre-pressurises the bottle with CO2 to match the product tank pressure, allowing carbonated liquid to transfer without losing dissolved CO2.
Used isobaric lines are available across a wide throughput range, from craft brewery and boutique Prosecco configurations to industrial beer and CSD installations. Rated output is stated per machine and depends on container format and product.
Technical Buying Guide — Used Isobaric Bottling Lines
The isobaric filler is the heart of a counter-pressure bottling line. Critical inspection points: the rated working pressure shown for the specific filler compared with your product and process, counter-pressure valve condition and seal integrity, the CO2 pre-evacuation system where fitted, dissolved O2 pickup at operating speed, and the pressure-equipment documentation available for that machine.
Product compatibility determines filler configuration: beer calls for low oxygen pickup and may need pasteurisation downstream; sparkling wine needs wirehooding after corking; CSD needs a premix or saturator upstream; sparkling water is normally screw-capped and roll-fed labelled. Confirm how the specific machine is configured.
Frequently asked questions
What products require isobaric filling?
Any carbonated beverage: beer, sparkling wine, Prosecco, Champagne, carbonated soft drinks (CSD), sparkling water, energy drinks, hard seltzer. Still products use gravity or volumetric filling.
What should I check on a used isobaric bottling line?
Check the filler working pressure rating against your product, counter-pressure valve and seal condition, CO2 pre-evacuation system, pressure vessel certification, closure section (crown, cork and wirehooder, or screw cap) and the documentation supplied with the machine.