... the following types: 1, D Type: D Series pumps for distribution does not contain solid particles, ... and drainage purposes. 2, DF-type: DF Series pumps for distribution does not contain solid particles, ... and so on. 3, DY Model: DY series of pump used for delivery does not contain solid particles, ... MD (or the DM-type): MD (or DM) series for the delivery particle concentration ≤ 1.5%, particle size ...