It mainly includes flow and head, as well as shaft power, speed and necessary NPSH. Flow refers to the amount of liquid output through the pump outlet in a unit time, generally volume flow; The head is the energy increment from the inlet to the outlet of the pump for delivering liquid per unit weight. For positive displacement pumps, the energy increment is mainly on the increase of pressure energy, so it is usually expressed as pressure increment instead of head. The efficiency of the pump is not an independent performance parameter. It can be calculated by other performance parameters such as flow, head and shaft power according to the formula. On the contrary, the shaft power can also be calculated when the flow, head and efficiency are known.

There is a certain interdependence between the performance parameters of alfalaval pump. You can test the pump, measure and calculate the parameter values, and draw curves to express them. These curves are called pump characteristic curves. Each pump has a specific characteristic curve, which is provided by the pump manufacturer. Generally, the recommended performance range is also indicated on the characteristic curve given by the factory, which is called the working range of the pump.

  Alfalaval The actual working point of is determined by the intersection of the pump curve and the pump device characteristic curve. When selecting and using the pump, the working point of alfalaval pump should be within the working range to ensure operation economy and * *. In addition, when the same pump delivers liquids with different viscosity, its characteristic curve will also change. Generally, the characteristic curve given by the pump manufacturer mostly refers to the characteristic curve when delivering clean cold water. For power pumps, as the liquid viscosity increases, the head and efficiency decrease, and the shaft power increases. Therefore, in industry, sometimes the liquid with high viscosity is heated to reduce the viscosity, so as to improve the transmission efficiency.  

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