Positioning of the shaft in centrifugal double-support pumps

Mm. Let’s explain it step by step. In the original BB1 series, which had supports at both ends, there were fillers used; nowadays, most BB models come with integrated seals. These integrated seals are designed to have limits or positioning steps, so no adjustment is needed – they’re already set up when purchased. Unless the seals have been in use for a long time or problems arise due to compression, the amount of adjustment required depends on operating conditions and the design of the seal, so it cannot be generalized. For the positioning of the 2 axes, it depends on the BB number; some rotors have shaft sleeves built into them for positioning, while in others it’s at the bearing on the non-driving end, or at the balance disc (sleeve). The designs vary from manufacturer to manufacturer (this statement may not be entirely accurate, so please approach it with caution). As for the lip seals… I’m not sure why you’re asking about these. First, you need to understand their function: in simple terms, they provide radial support, reduce circumferential losses, and help regulate axial forces. In my opinion, the biggest impact of gaps is a reduction in efficiency

In my opinion, the mechanical seal is located on the inside side; first, install the mechanical seal onto the pump body, fit in the bearings, adjust the clearance, and then axial positioning is complete. (At this point, the mechanical seal remains fixed to the pump body and does not move with the shaft.) Then, lock the locking sleeve of the mechanical seal shaft onto the shaft, and release the position setting clip to complete the process. It’s equivalent to first positioning the entire set of mechanical seals relative to the pump body; after the shaft is positioned using bearings, the rotating parts of the mechanical seals are then positioned relative to the shaft – and that’s it!