Single screw pump conveying various viscosity of liquid, especially thick hard to transport medium. G single screw pump conveying liquid and after separation, dehydration of various concentration of dry material. G single screw pump conveying liquid containing solid particles, fibers, suspended solids. G single screw pump conveying liquid, the mixture of gas and solid. G single screw pump conveying cannot be stirred, shear, robbing the sensitivity of the liquid. G single screw pump forhandling corrosive liquid.