A liquid band vacuum pump is simple to operate and is used in several applications across various industries. A liquid ring pump works together with a sealant required in its operation. This liquid could be water, essential oil or any additional solvent which is definitely rotated by an impeller within the casing of the pump.
As the shaft turns, a liquid band is created by the centrifugal force generated by the rotating impeller. This power holds the liquid ring against the inner wall of the pumping chamber. Because the impeller is located eccentric to the pumping chamber, the depth of Liquid-Ring Vacuum Pump china access of the blades in to the liquid ring reduces and raises as the impeller rotates. This creates increasing cellular volume on the inlet port side, creating vacuum.
On the discharge slot side, the impeller cell volume decreases as the blades move further in to the 
liquid ring. This escalates the pressure until discharge occurs through the discharge slot.
A continuous flow of new sealing liquid comes to the pump via the sealing-liquid inlet.
In the case of the two-stage liquid band pump, the discharge from the 1st stage will not discharge to atmosphere. Rather, the initial stage discharges through the manifold resulting in the second stage in addition to through a discharge interface positioned in the intermediate plate between the first- and second-stage impellers.