| 摘要 |
A progressive cavity pumping system includes a pump housing, a rotor member operatively received in the pump housing, a prime mover coupled to the rotor member for driving the rotor member in first and second directions and a controlling means for actuating the prime mover, wherein the controlling automatically causes the rotor member to be driven in the second direction after shut down or idling of the pumping system. A method of operating the pumping system includes automatically driving the rotor member in a second direction after initiating shut down or idling of the pumping system and prior to start up of the same.
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