With the development of pharmaceutical and pesticide sectors, manufacturing processes impose increasingly strict requirements on cleaning, sterilization and sealing of reaction equipment. Therefore, valves applied under such service conditions are often required to achieve zero‑leakage so as to prevent contamination of pharmaceuticals during production. The operating area shall be free of pungent odor and smoke, putting stringent requirements on valve manufacturing. Meanwhile, driven by development trends of the pesticide industry, various types of valves will gain wider application in pharmaceutical and pesticide fields.