... -long self-absorption 2).ISO9001, ISO140001 WFB series of non-sealing self-control self-priming pump is to fill the gaps ... -type multi-faceted pump centrifugal sealing device", and to eradicate the traditional pump packing seal, packing seals, mechanical seal defects, the total ... and other equipment for the best. 2, run during the sealing device is not friction, no wear, longer service life than ...