Positive pressure holding method in tank and positive pressure holding device in tank

摘要

In order to maintain positive pressure in tanks for storing a product liquid and flow passages connecting the same, the present invention prevents the flavor of a product liquid from remaining in a sterilization filter provided in an air supply device supplied with the product liquid, and prevents the flavor of the product liquid which previously filled the tanks from transferring to the product liquid that fills the tanks next. Provided is an air discharge device which, when the pressure of the air in the head space in a one or more tanks among a surge tank for storing the product liquid, a carbonated surge tank for storing a carbon dioxide-added product liquid, and a header tank provided in the vicinity of a filling device for filling the product liquid into a container increases, discharges the air in the head space.