Submersible WQ sewage pump sand dredging slurry pump mud suction sewage pump for dirty water submersible deep well multistage pump is mainly comprised of three parts: pump, mechanical seals and motor. Pump is at the lowerpart of sewage pump, and the structure is impeller and shell . Motor located at the upperpart of the motor pump, which i s the singl ephase or three-phase electric motor. Mechanical seals are betweenpump and motor and it is a kind of double end mechanicalseals,"o"rings are applied in all st at ic joint s of the submer sible pump.