抽水流量增加，抽、回水口降深绝对值基本呈线性增加，从而增加抽水和回灌压力。
When the pumping flow increases, the absolute values of pumping and injection drawdown were increased linearly on the whole, so the pressure of pumping and injection was increased.
分布式变频泵供热系统中存在零压差点，该点供回水压力相等。
In the heat-supply system with distributed variable frequency pump, there exists a zero pressure difference, at which supply and return water pressures are equal.
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