Double pump casing structure. High efficiency, wear resistance, stable performance, and strong part interchangeability. The liner and impeller materials can be wear-resistant metal or rubber. The pump outlet direction can be rotated at intervals of 45° for installation at eight different angles. It supports multi-stage series connection, as well as belt drive and direct-coupled drive. The shaft seal can adopt packing seal, auxiliary impeller seal or mechanical seal. The pump rotates clockwise when viewed from the drive end.