1. Pump-The machine or mechanism that converts the mechanical energy of the prime mover into fluid energy is called a pump. The pump is used to increase the liquid's potential energy, pressure energy, and kinetic energy (high-speed liquid flow).

2. Flow rate-the amount of liquid (volume or mass) that flows through a cross section per unit time. Expressed with Q. The unit is: m3/h, m3/s, l/min.

3. Head---the liquid of unit mass is transported from the inlet of the pump to the value-added energy. Represented by H. The unit is: MPa, m.

4. Rotation speed-the number of revolutions per unit time of the axis. Represented by n. The unit is: r/min.

5. Equipped with power-rated power of the prime mover. Represented by N. The unit is: kW.

6. Shaft power-the power transferred from the prime mover to the pump shaft. Represented by P. The unit is: kW.

7. Effective power --- Also known as output power, the effective energy obtained in the pump by the liquid delivered from the pump per unit time. Expressed in Pa. The unit is: kW.

8. Efficiency-the ratio of effective power to shaft power. Represented by η.

9. Cavitation surplus --- the rich energy per unit mass of liquid at the suction port of the pump exceeds the vaporization pressure of the liquid (expressed in meters of liquid column). Expressed with NPSH. The unit is: m.

10. Must have cavitation surplus --- the cavitation surplus determined by the pump factory according to the test (in meter liquid column). Expressed as NPSHr. The unit is: m. The pump cavitation margin is determined by the characteristics of the pump itself, and is a parameter that represents the pump's anti-cavitation performance. To improve the anti-cavitation performance of the pump itself, the cavitation margin must be reduced as much as possible.

11. Vacuum suction height --- Also called vacuum degree, the vacuum degree of the suction port (measured in meters of liquid column) from the pump reference surface. Expressed with Hs. The unit is: m. The domestic old samples reflect the cavitation performance of the pump by sucking the vacuum height, and this index has now been eliminated. The conversion of Hs and NPSHr values is as follows:

NPSHr≈10- Hs

12. Series---The pump series refers to the pumps of the same structure and purpose produced by the pump factory. Such as IS series clean water pump, IH series chemical pump, S series open pump, etc.