| 摘要 |
The invention relates to a device for regulating pumping rates and for electrical and mechanical protection for beam engine pumps, driven by low voltage electric ac motors. (Up to 460 volts). This device according to the invention makes it possible to regulate the pumping rates and to provide electrical and mechanical protection, continuously, for beam engine pumps, driven without it being necessary to stop them, and to replace and/or modify their driving members. <IMAGE>
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