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....The company has accumulated the production experience of single screw pump for near 30 years, and established the project technicians team at earlier 1998, undergoing three years repeated experiments and devotion, at this year, we eventually developed double screw single screw pump and got the patent of this, its main theory of working component is explained as following: one rotor with single screw and one stator made of usual elastic materials with double screw, while the rotor is making planet circuit along the axes of stator and within chamber of that, and displacement is produced as the spiral curve by the air-tight chamber between rotor and stator. This new product features larger flux and bilateral fluid symmetry and benefits to the balanced operation and long time length of life compared with similar single screw pumps, meanwhile, it makes the company rank first on the respect of production technology of single screw pump.