D Series Horizontal Multistage Centrifugal Pumps D, DF, DY series of sub-horizontal single-suction multi-stage centrifugal pumps, using the state ... water, oil, corrosive or abrasive-containing medium, etc.. Horizontal multi-stage centrifugal pumps according to their scope of use ... water supply and drainage purposes. 2, DF-type: DF Series pumps for distribution does not contain solid particles, the ...