With the development of the times, advancement of science and technology, and continuous improvement of people’s living standards, the application scope of biochemical engineering has been continuously expanded. This brings about large‑scale, modern and automated industrial production of pharmaceutical products. Valves are indispensable control fittings in the fermentation workshops of modern pharmaceutical plants. They are used to cut off or connect fluids such as steam, water, culture medium and air, regulate fluid flow rate, and control pressure inside pipelines or vessels.