WD-series pumps are horizontal corrosion-resistant centrifugal pumps, with spacious impeller flow channel and superior hydraulic performance. The back shroud of impeller is equipped with back blade, which can reduce media leakage. In order to recover pump’s performance when flow passage components are worn and corroded, axial adjusting device is equipped to adjust the space between impeller and pump body. Variable types of shaft seal (including mechanical seal, dynamic seal + packing seal, dynamic seal + K-type seal) are adopted to meet the shaft sealing requirements for carrying variable media).