... Sensor, Frequency electrical submersible motor, protector, gas-liquid separator, multi stages centrifugal pump, check valve, relief valve, motor flat ... pressure, also to lubricate & cool the motor. (3)The multi-stage centrifugal pump has higher efficiency than rod pump, not ... & workover. It’s the best system for deviated & cluster well, especially for multi-lateral horizontal well. It can be installed ...