Vertical turbine pumps (equivalent to Process Systems Thrust Head) have proven cost effective due to the ease of maintenance and long service life.
垂直涡轮泵(相当于系统过程推动头)由于易于维修和较长的使用期限已被证明是节省成本的。
It is suggested to apply the principle of effective gravity and equivalent pressure head to calculate the rotational speed and ingate area in the processing of grinding ball by centrifugal casting.
在离心铸球工艺中，可应用有效重度和等效压头原理计算转速和内浇口断面积。
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