Selection of single screw pump specifications are based on the nature of liquid being transported and flow, pressure to determine, and the pump speed by the viscosity and corrosive liquid delivery, as the main parameters to choose, in order to ensure reliable operation of the pump. The design speed of the single-screw pump is the maximum allowable speed when conveying non-corrosive liquids with similar water or clear water. In actual use, the design requirements of the single-screw pump are different from the requirements of the properties and the life of the medium. For high viscosity and medium containing particles, the design speed of 1 / 2-1 / 3 or lower is generally used. Low speed is good for pump wear. However, the wear rate of the stator decreases after use. At this time, the speed can be properly increased , To compensate for the decline in traffic is also a policy. Transmission medium temperature should be -10 ℃ ~ 80 ℃ in special cases up to 120 ℃. The normal pressure of each stage of the pump (one lead of the stator) is 0.6 Mpa, allowing up to 0.8 Mpa in a short period of time (less than 30 minutes), and gradually decreasing the volumetric efficiency at the same output pressure when worn. Pumping water maximum suction is 8 meters, the actual use of recommendations not exceeding 6.5 meters, when pumping high-viscosity media, should be positive pressure inhalation.
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