Axial thrust balancing in a multistage stacked impeller design
In these designs, a balancing drum or piston is provided. This is a rotating circular disc,
which runs against a stationary corresponding disc or ring with a close clearance. The
pressure of the liquid is dropped across this labyrinth passage. This leak is connected
back to the suction of the pump.
The pressure difference across the drum is same as the net of the discharge and suction
pressures. The force generated due to the drum is in a direction opposite to that acting ...
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