These formula are suitable for various designs of correctors with single -, multi-stage series in leading, lagging and lagging-leading.
这些公式适用于单级及多级的串联超前、滞后以及滞后——超前等各种校正器的设计。
Mechanical seal: this type is especially suitable for multi-stage slurry pump in series and without leakage.
机械密封：该形式的密封特别适用于多级串联渣浆泵的密封，完全无泄漏。
The GC series boiler feed pump is multi-stage single-suction sectional horizontal centrifugal pumps.
本系列泵是卧式单吸多级节段式离心泵。
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