Three screw pump is a rotary pump volume, it is the screw tooth principle, rely on the rotation of the screw in the pump casing mesh with each other, to be transported together media closed cavity in the tooth, along the axial direction of the screw continuous uniform pushed to outlet, in order to provide a stable system pressure. Three screw pump for conveying non corrosive oil and similar oil and lubricating liquid. The range of liquid viscosity is generally 3 ~ 760mm2/s (1.2 ~ 100`e), high viscosity medium can be heated to reduce viscosity after delivery, the temperature is generally not more than 150.