What component is used to prevent internal re-circulation on a centrifugal pump?

In the context of centrifugal pumps, wear rings play a crucial role in preventing internal recirculation. Centrifugal pumps rely on the movement of fluid through the impeller and volute casing to generate flow and pressure. When the clearance between the impeller and the casing is too large, some of the fluid may flow back into the inlet of the pump rather than being pushed out through the discharge. This internal recirculation can reduce efficiency and lead to performance issues.

Wear rings are specifically designed to maintain a close clearance between the rotating impeller and the stationary casing, minimizing the gap where fluid could potentially recirculate. They help ensure that the majority of the fluid is directed through the intended flow path, enhancing the pump's overall efficiency and effectiveness.

In contrast, seals are primarily used to prevent fluid leakage to the atmosphere, gaskets serve to create a seal between two mating surfaces, and strainers are utilized to filter out debris from the pumped fluid. While these components are important to the overall operation of a pump system, it is the wear rings that directly address the issue of internal recirculation, ensuring optimal flow dynamics within the centrifugal pump.