Vertical pressure vessel Biological fermenter is a kind of equipment specially designed for microbial fermentation process, its structure is usually vertical, flat top cover, oval head, with a standard jacket and a disc turbine stirring device. This design is not only easy to operate and maintain, but also improves fermentation efficiency and product quality. The material of the fermenter is mostly stainless steel, such as 316L material in the contact with the liquid medicine, and 304 material is used in the rest to ensure the corrosion resistance and safety of the equipment.