I would appreciate some advice from experts: the sealed flushing pipeline that leads out from the middle of the pump body in this multi-stage centrifugal pump:
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The pressure at the front end of the pump is lower than the pressure at the outlet point, which is understandable； The pressure in the seal chamber at the rear end of the pump is higher than that at the midpoint of the pump body. How does this pipeline enable flushing of the seal at the rear end from the outlet point?
The pressure in the seal chamber at the rear end of the pump is not as high as in the middle section, as there is a balance pipeline leading to the inlet connected to the balance disk or balance drum at the rear end
The pressure for sealing flushing does not necessarily need to be higher than the outlet pressure; this also depends on the structure of the seal
The pressure in the rear seal chamber is essentially the same as the pressure on the low-pressure side of the balance disk, and it is roughly equal to the inlet pressure.
I believe the pressure at the intermediate outlet is greater than the pressure in the sealing chambers at both ends
The label on the diagram indicates the balance tube; the pressure in the sealing chamber on the non-driving side is only slightly higher than the pressure in the sealing chamber on the driving side. The pressure of the flushing fluid introduced in the middle section is higher than the pressure in the sealing chambers on both sides