Packing seals are mechanical devices used to prevent the leakage of fluids or gases in various applications, such as pumps, valves, and compressors. They are typically made from materials like rubber, plastic, or metal and are designed to fit tightly around moving parts, creating a barrier that keeps substances contained. These seals work by compressing against a surface, which helps to maintain pressure and prevent unwanted escape of the material being contained. Proper installation and maintenance of packing seals are essential for ensuring their effectiveness and prolonging the lifespan of equipment, such as pumps and compressors.