The sliding vane pump consists of all the following components except for which one?

A sliding vane pump operates using a specific set of components that facilitate its unique method of transferring fluids. The key elements include an eccentric casing, a rotor, and sliding vanes.

The eccentric casing is designed to create a space where the vanes can slide in and out, allowing for the formation of varying-sized chambers that contribute to the pumping action as the rotor spins. The rotor, typically located within the casing, is connected to the power source and revolves around the center of the pump, driving the sliding vanes outward against the casing wall.

The sliding vanes are integral to the operation of the pump. As the rotor turns, these vanes extend and retract, creating low-pressure zones that help draw fluid into the pump and subsequently move it through the discharge side.

In contrast, an impeller is not a component of a sliding vane pump. Impellers are typically found in centrifugal pumps, where they play a crucial role in moving fluids by converting rotational energy into kinetic energy. The design and function of sliding vane pumps do not incorporate an impeller, making this component the correct answer to the question.