From which end of the pump is the direction of rotation defined?

The direction of rotation for a pump is defined from the drive end. This is where the motor or external drive mechanism connects to the pump rotor and begins the pumping action. The drive end is critical because it dictates how the internal components, including the impeller or gears, will function to create the necessary pressure to move the fluid.

When assessing pump performance and setup, understanding this orientation from the drive end is essential. It ensures that the pump operates efficiently and that the direction of fluid flow aligns with the design specifications. Proper identification of the drive end helps in troubleshooting and installation, ensuring that all connections and fittings are made in accordance with the intended flow direction established by the pump's design.