原文：
水泵的性能参数如流量Q 扬程H 轴功率N 转速n 效率η之间存在的一定的关系。他们之间的量值变化关系用曲线来表示，这种曲线就称为水泵的性能曲线。 水泵的性能参数之间的相互变化关系及相互制约性：首先以该水泵的额顶转速为先决条件的。 水泵性能曲线主要有三条曲线：流量—扬程曲线，流量—功率曲线，流量—效率曲线。 1、流量—扬程特性曲线 它是离心泵的基本的性能曲线。比转速小于80的离心泵具有上升和下降的特点（既中间凸起，两边下弯），称驼峰性能曲线。比转速在80～150之间的离心泵具有平坦的性能曲线。比转数在150以上的离心泵具有陡降性能曲线。一般的说，当流量小时，扬程就高，随着流量的增加扬程就逐渐下降。 2、流量—功率曲线 轴功率是随着流量而增加的，当流量Q=0时，相应的轴功率并不等于零，而为一定值（约正常运行的60％左右）。这个功率主要消耗于机械损失上。此时水泵里是充满水的，如果长时间的运行，会导致泵内温度不断升高，泵壳，轴承会发热，严重时可能使泵体热力变形，我们称为“闷水头”，此时扬程为{zd0}值，当出水阀逐渐打开时，流量就会逐渐增加，轴功率亦缓慢的增加。 3、流量—效率曲线 它的曲线象山头形状，当流量为零时，效率也等于零，随着流量的增大，效率也逐渐的增加，但增加到一定数值之后效率就下降了，效率有一个{zg}值，在{zg}效率点附近，效率都比较高，这个区域称为高效率区。

“ Several important centrifugal pump performance curve ”是由提供的水泵行业新闻，译文仅供参考。另外，中国离心泵网还提供相关产品搜索：、、、、等。

译文：
Pump performance parameters such as flow rate Q H lift shaft power N speed n efficiency η a certain relationship exists between. The magnitude of change in relations between them with a curve that this curve is called the pump performance curve. Pump performance parameters of relationship between the change and restricted: first to the top of the pump speed is the amount of pre-conditions. Pump performance curve are mainly three curves: the flow - lift curve and flow - the power curve, flow - efficiency curve. 1, flow - lift curve It is the basic pump performance curve. Specific speed centrifugal pumps with less than 80, the rise and fall characteristics (both intermediate raised on both sides under the curve), said the performance curve of the hump. Than the speed of the pump between 80 to 150 with a flat performance curve. Specific speed centrifugal pumps in more than 150 performance curve has a steep drop. In general, when the traffic hours, head on high, lift with increasing flow was gradually decreased. 2, flow - power curve Shaft power is increased with the flow, when the flow rate Q = 0, the corresponding shaft power is not equal to zero, and for the certain value (about 60% of normal operation). The power consumed in the mechanical loss of the principal. At this point is full of water pump in, if long run, will cause the pump to the temperature rising, pump casing, bearings may have a fever, severe deformation may pump heat, we called the "stuffy head", at this time head for the maximum, when the valve is gradually opened, the flow will gradually increase, shaft power is slowly increased. 3, flow - efficiency curve It is the shape of the curve Elephant head, when the flow is zero, the efficiency is equal to zero, as the flow increases, the efficiency gradually increased, but increased the efficiency of the drop after a certain value, and efficiency has a maximum value, the maximum efficiency point, efficiency is relatively high, the region known as the high efficiency area.