A liquid band vacuum pump is easy to operate and can be used in a number of applications across various industries. A liquid band pump works together with a sealant required in its operation. This liquid could be water, essential oil or any various other solvent which is rotated by an impeller within the casing of the pump.
As the shaft turns, a liquid ring is established by the centrifugal force produced by the rotating impeller. This pressure holds the liquid band against the inner wall of the pumping chamber. Because the impeller is situated eccentric to the pumping chamber, the depth of entry of the blades into the liquid ring decreases and raises as 
the impeller rotates. This creates increasing cellular volume on the inlet port side, Liquid-Ring Vacuum Pump china creating vacuum.
On the discharge port side, the impeller cell volume decreases as the blades move further in to the liquid ring. This increases the pressure until discharge takes place through the discharge slot.
A continuing flow of new sealing liquid comes to the pump via the sealing-liquid inlet.
In the case of the two-stage liquid ring pump, the discharge from the initial stage does not discharge to atmosphere. Instead, the initial stage discharges through the manifold leading to the second stage and also through a discharge interface positioned in the intermediate plate between the first- and second-stage impellers.