In the field of progressive cavity pumps, the term “bare shaft” refers to the pump unit without the Pump Base and Drive/Power Source included, such as an electric motor/gear motor. A bareshaft progressive cavity pump typically consists of the pump body, helical rotor, elastomer stator, coupling rod, connecting shaft, universal joint set, etc. However, it lacks the pump base, the electric motor, or other driving mechanism. People also call it Bareshaft Pump.

The progressive cavity pump operates through the interaction of the rotating eccentric rotor and the stationary elastomeric stator. When the rotor rotates within the stator, cavities are formed and progress from the suction side to the discharge side, conveying the fluid being pumped. However, to make the pump operational, it should be coupled with a suitable drive, such as an electric motor or hydraulic system.

By providing a bare shaft pump, the PC pump suppliers allow users to choose and install a motor or drive that best suits their specific requirements. This flexibility allows for customization in terms of motor power, speed, and control options. It depends on the application. The bareshaft design also facilitates the maintenance and replacement of individual PC pump components, as well as the ability to integrate the pump into existing systems or configurations.