The hydrodynamic seal of the auxiliary impeller refers to the installation of an open impeller in the opposite direction coaxially near the back of the back cover of the impeller of the pump. When the pump is working, the auxiliary impeller rotates with the main shaft of the pump, and the liquid in the auxiliary impeller also rotates together. The rotating liquid will generate an outward centrifugal force. On the one hand, this centrifugal force resists the liquid flowing to the mechanical seal and reduces the mechanical pressure at the seal. On the other hand, the solid particles in the medium are prevented from entering the friction pair of the mechanical seal, which reduces the wear of the grinding block of the mechanical seal and prolongs its service life. The material of the auxiliary impeller is A05 and ductile iron.                                                                                                                                                                            Winclan Slurry Pump EXpellers are 100% interchangeable with AH slurry pump.                               1.5/1B-YA Slurry Pump code: B028