在供水系统管路中，供水质量主要由两个方面决定：水泵扬程特性和管阻特性。

In the water supply system pipeline, the quality of water supply is mainly determined by two aspects: the pump lift characteristics and the pipe resistance characteristics. The head characteristic reflects the relationship between the head H and the water flow Q. When the valve opening and the pump speed are constant, the larger the flow Q, the smaller the head H. The flow rate mainly depends on the user's water consumption. ; The pipe resistance characteristic reflects the energy of the pump to overcome the water level and pressure difference of the pump system, and the changing law of the resistance of the liquid flowing in the pipeline. When the speed of the pump is constant and the valve is constant, the greater the head H, the flow Q Also bigger. The intersection of the head characteristic curve and the pipe resistance characteristic curve is called the working point of the water supply system, as shown in point A in the figure. At this point, the user's water flow Qu and the water supply flow Qc of the water supply system are in a balanced state. The water supply system not only meets the head characteristics, but also meets the pipe resistance characteristics, and the system operates stably.

In the pipeline of water supply system, the quality of water supply is mainly determined by two aspects: pump hoist characteristics and pipe resistance characteristics. The head characteristics reflect the relationship between the head H and the water flow Q, in the valve opening degree and pump speed are unchanged, the flow Q is larger, the lower the head H, the size of the flow mainly depends on the user's water situation; The intersection of the hoist characteristic curve and the pipe resistance characteristic curve, called the working point of the water supply system, as shown at point A. At this point, the user's water flow Qu and the water supply system's water supply Qc are in a balanced state, the water supply system not only meets the head characteristics, but also meets the pipe resistance characteristics, the system is stable operation.

In the pipeline of water supply system, the quality of water supply is mainly determined by two aspects: pump head characteristics and pipe resistance characteristics. The head characteristic reflects the relationship between head h and water flow Q. under the condition of constant valve opening and pump speed, the larger the flow Q is, the smaller the head h is. The flow mainly depends on the user's water consumption; the pipe resistance characteristic reflects the energy of the pump used to overcome the water level and pressure difference of the pump system, and the variation law of the liquid flow resistance in the pipeline Under the condition of constant speed and constant valve, the greater the head h, the greater the flow Q. The intersection of the head characteristic curve and the pipe resistance characteristic curve is called the working point of the water supply system, as shown in point a in the figure. At this point, the user's water flow Qu and the water supply flow QC of the water supply system are in equilibrium. The water supply system not only meets the head characteristics, but also meets the pipe resistance characteristics, so the system operates stably.