What is the primary function of a mechanical seal in machinery?

The primary function of a mechanical seal in machinery is to prevent fluid leakage. Mechanical seals are used to create a tight barrier between rotating and stationary components, such as a rotating shaft and the housing, effectively sealing fluid inside the machinery. This is crucial in various applications because leakage can lead to contamination, loss of lubricant, or other operational failures. By containing the fluid, mechanical seals help maintain the integrity of the system, improve safety by preventing hazardous leaks, and reduce maintenance needs due to fluid loss. Other functions, such as enhancing performance or efficiency, are more secondary effects of a well-functioning seal rather than its primary purpose.