What does a mechanical seal do in a pump?

A mechanical seal serves a crucial role in a pump by effectively preventing fluid, such as water, from leaking out of the pump and simultaneously ensuring that air does not enter the pump system. This is vital for maintaining the efficiency and proper operation of the pump, as any leakage could lead to loss of fluid, reduced performance, and potential damage to the equipment.

By providing a tight seal between the rotating shaft and the stationary pump housing, the mechanical seal minimizes the risk of leaking, which helps in maintaining the required pressure and flow within the system. Additionally, controlling the ingress of air is essential to avoid issues such as cavitation that can arise due to air entering the pump, further ensuring reliability and longevity in pump operation.

The other options, while relevant in a broader context of pump function and operation, do not directly describe the primary function of a mechanical seal. Increasing pressure, measuring flow rates, and regulating temperature represent different components and functions in pump and system designs.