Which type of pump is described as steam-driven and double-acting?

A steam-driven and double-acting pump is best described as a duplex pump. Duplex pumps operate using two sets of moving parts, often involving pistons that alternate in action. This design allows for continuous flow, as one piston is always in the process of displacing fluid while the other is refilling. The double-acting feature means that both sides of a piston are utilized, contributing to higher efficiency and a more stable flow rate.

The application of steam as a driving force further indicates that this pump type is suited for environments where steam power is readily available, making it effective in various industrial applications. While other types of pumps, such as simplex, centrifugal, and rotary pumps, are commonly used in different contexts, they do not share the specific characteristics of being steam-driven and double-acting as the duplex pump does.