What is a key characteristic of a rotary vane pump?

A key characteristic of a rotary vane pump is that it has a self-adjusting part that lowers maintenance. This self-adjusting feature allows the pump to maintain performance over time, as the vanes can automatically adjust to wear and tear, reducing the frequency and extent of maintenance needed. This is particularly beneficial in maintaining consistent efficiency in applications where fluid movement is critical.

While the other options mention various aspects of pumps, they do not emphasize the self-adjusting design feature that significantly contributes to the reduced maintenance requirement of rotary vane pumps. Understanding this characteristic can help operators appreciate the operational efficiency and reliability of rotary vane pumps in various applications.