Dry screw vacuum pumps excel in clean, oil-free operation and high energy efficiency, making them particularly suitable for industries with stringent demands on product purity and process cleanliness, such as pharmaceuticals, food processing, semiconductors, and precision electronics. They effectively prevent oil vapor contamination and offer relatively simple maintenance. In contrast, water ring vacuum pumps stand out due to their simple, robust design, corrosion resistance, and exceptional ability to handle gas mixtures containing large amounts of water vapor, solvent vapors, dust, or even mildly corrosive components. Their near-isothermal compression process also provides high safety. Consequently, they are widely used in complex operating conditions or applications with contamination risks, such as chemical processing, power generation, papermaking, plastics, food packaging (rough vacuum), and handling flammable/explosive gases (e.g., petrochemicals). While screw pumps are superior in precision fields demanding high cleanliness and energy efficiency, water ring pumps offer cost-effectiveness, reliability, and durability when dealing with complex media and rough vacuum applications. Their advantages are complementary, collectively covering a broad spectrum of industrial vacuum needs.