Which component seals against leaks around the pump shaft?

The component that seals against leaks around the pump shaft is typically referred to as a seal. A seal is designed to prevent the leakage of liquid or gas from the pump casing while allowing the shaft to rotate freely. This is crucial in ensuring the efficiency of the pump and preventing any contaminants from entering the system.

In many pumping applications, seals are specifically engineered to accommodate various operating conditions, such as pressure changes and temperature variations, ensuring a reliable barrier against leaks. Seals can come in different types, including mechanical seals and lip seals, each suited for their specific use depending on the pump design and application.

While gaskets and packing can also contribute to sealing functions, they are generally used in different parts of pumps or associated systems. Gaskets typically provide sealing between flat surfaces, while packing involves using materials to fill spaces around rotating shafts. Their functional roles differ from that of a seal which is specifically designed for the dynamic relationship between the pump shaft and the surrounding casing to prevent leakage.