The precaution of using the centrifugal pump

Centrifugal pump is a kind of vane pump, which relies on the rotating impeller. In the process of rotation, due to the interaction between the blade and the liquid, the blade transmits mechanical energy to the liquid, so that the pressure of the liquid can be increased to achieve the purpose of conveying the liquid. Four points should be paid attention to when starting the centrifugal pump:
① The head produced by centrifugal pump at a certain speed has a limited value. The operating point flow and shaft power depend on the condition of the device system connected to the pump (level difference, pressure difference and pipeline loss). The head changes with the flow.

② Stable operation, continuous transportation, no pulsation of flow and pressure.

③ Generally, the centrifugal pump has no self-priming capacity. It is necessary to fill the pump with liquid or vacuum the pipeline before starting to work.

④ The centrifugal pump is started when the discharge pipeline valve is closed, and the vortex pump and axial flow pump are started when the valve is fully open to reduce the starting power.

Because the centrifugal pump relies on the suction of the vacuum formed by the centrifugal force of the impeller to lift the water, when the centrifugal pump is started, the gate valve must be closed and filled with water. When the water level is above the impeller, discharge the air in the centrifugal pump before starting. After startup, a vacuum is formed around the impeller to suck up the water, and its gate valve can be opened automatically to lift the water. Therefore, the gate valve must be closed first.