Introduction: PH series pumps are a kind of vertical single stage single suction cantilever centrifuge slurry one. It may be used in getting rid of trash and transport liquid mixed with sandstone by waterpower at power station. Its largeest grit is no more than 25mm, and it can allow sandstone with diameter of about 50mm pass through discontinuously. By now, the models produced by our factory are 4PH, 6PH, 8PH(I), 10PH(I) and 4PH-60 with longer lifetime, simple construction and high reliability.