齿轮泵缺点：由于较小的置换容积以及会磨损齿牙，所以只能输送干净的流体；
Disadvantages: the gear teeth due to smaller displacement volume and will wear, so can only transport clean fluid;
每一种用来控制水锤撞击的装置都需要置换规定数量立方英尺的容积。
A prescribed amount of cubic inch displacement is required for each type of device intended for the control of shock.
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