In any centrifugal pump, each impeller tends to produces some amount of thrust because of different pressures
and different geometries on the two sides of the impeller. In a high pressure multi-stage pump (such as BFW)
the number of impellers is high, thus the net thrust would be large unless something is done to balance it out.
The two main ways to reduce the net thrust are to oppose the impellers or to use a balance disk/drum.
We provide the high quality balance disc which balances the net thrust.