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Oil booster pump is a kind of jet pump, the working pressure range of 10-1 ~ 10-4Torr, 10-2 ~ 10-3 Torr pressure range has a larger pumping speed, can be used as the oil diffusion pump before Vacuum pump. It is mainly composed of pump body, ejector, draft tube, boiler and return pipe. The ejector consists of Laval nozzle and supersonic diffuser. To improve the steam density at the pump wall, the pump body made of conical. High pressure boiler (boiler), have a larger pan height and return height.