The screw pump is a volumetric rotor pump, which is drawn and discharged by the volume change of the sealing chamber formed by the screw and bushing. The screw pump is divided into Single Screw Pump, double, three and five screw pump. The screw pump is characterized by stable flow, small pressure pulsation, self-absorption capacity, low noise, high efficiency, long life and reliable work. And its outstanding advantage is the transmission medium does not form the eddy, the viscosity of the medium is not sensitive, can deliver the high viscosity medium.