Liquid filling machines can be divided into atmospheric pressure and air pressure. Atmospheric pressure filling machine uses the self-weight of liquid at atmospheric pressure to fill. These filling machines are divided into regular filling and constant volume filling, which are only suitable for filling low viscosity liquids without gas, such as milk, liquor and mineral water. The pressure filling machine fills at a pressure higher than atmospheric pressure. The pressure in the liquid storage tank is higher than that in the bottle, and the liquid flows into the bottle by pressure difference. This method is often used in high-speed production lines. Pressure filling machine is suitable for filling liquids containing gas, such as beer, soda, champagne, etc. *