... DF, DY series of sub-horizontal single-suction multi-stage centrifugal pumps, using the state recommended hydraulic model of energy-efficient products ... 2, DF-type: DF Series pumps for distribution does not contain solid particles, the temperature is -20 ~ 105 corrosive liquids, pump ... used for delivery does not contain solid particles, the temperature is -20 ~ 105 , viscosity of less than 120 cSt ...