Centrifugal pump is a vane pump, relying on rotating impeller during rotation, due to the interaction between the blades and the liquid leaves the mechanical energy transmitted to the liquid, the liquid can increase the pressure to achieve the purpose of transmission fluid. Centrifugal pump starting need pay attention to four points:
1.Head at a certain speed centrifugal pump produced under a defined value. Flow and shaft power operating point depending on the unit system connected to the pump case (difference, the pressure difference and line losses). Lift with the flow rate changes.
2.Stable, continuous delivery, flow and pressure pulsation.
3.Generally no self-absorption capacity, the need to pump the liquid filled or evacuated after pipeline to start.
4.Centrifugal valve in the discharge line to start off, vortex flow and axial pumps in the valve is fully open state to start to reduce the starting power.
Because centrifugal impeller centrifugal force is formed by vacuum suction to lift the water, so that when the centrifugal pump starts, you must first close the valve, irrigation. Water level exceeds the portion above the impeller, centrifugal pump exhaust air before you start. After starting to form around the impeller vacuum to suck up the water, which can automatically open the valve, the water lifted. Thus, the valve must be closed.
