There are a few components that virtually every centrifugal pump has in common. These components include:

• An Impeller
• A volute or diffuser style casing
• A shaft
• Shaft sleeves
• Bearings
• A sealing arrangement

These parts can be subdivided into the wet end and the mechanical end.

The wet end of the pump includes those parts that dictate the hydraulic performance of pump.
The mechanical end includes those parts that support the impeller within the casing, seal the casing where the shaft passes through it and enable rotation – the means by which the wet end creates flow and pressure.

Wet End

We`ve already talked about the two primary parts of a pump: the casing and impeller. So we won`t spend much time on those here.

The short explanation is that the impeller rotates at a high speed and imparts velocity to the water. The impeller is positioned within the casing, and the casing converts the velocity generated by the rotation of the impeller into pressure. For a more detailed look at this process take a look at the article on this topic.

Mechanical End

The mechanical portion of the pump includes the pump shaft, shaft sleeve, sealing arrangement, and the bearings.