What applications necessitate the use of sealed ball bearings?

Sealed ball bearings are essential in applications where protection against contaminants and moisture is critical. In the case of pumps and disposers, these components are often exposed to various liquids, possibly including water, food particles, and other debris. The sealed design of ball bearings prevents these contaminants from entering the bearing, which can lead to wear, corrosion, and eventual failure.

In contrast, heavy-duty electrical equipment might not require the same level of moisture resistance, as these systems often operate in controlled environments. Low-speed motors may also not require sealed bearings, as their operational conditions can be less demanding, primarily regarding contamination. Non-water resistant machinery, by definition, wouldn't benefit from sealed bearings since they do not provide moisture protection and would likely be incompatible with the requirements of sealed designs. Thus, pumps and disposers are the ideal applications for sealed ball bearings due to their need for durability and protection from liquids and debris.