On some pumpers, the rotary counterbalance can be adjusted by shifting the position on the crank arms.
在某些抽油机上，旋转平衡块可由改变其在曲柄臂上的位置进行调整。
The paper introduces the circuit design and its function used for water supply of residential zone by adopting TD2100 converter to control four pumpers with circulation soft start.
介绍了利用TD 2 10 0变频器控制四台泵循环软起动，实现小区供水的电路设计及控制功能。
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