A liquid band vacuum pump is simple 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 procedure. This liquid could be water, essential oil or any various other solvent which is certainly rotated by an impeller within the casing of the pump.
As the shaft turns, a liquid band is created by the centrifugal force produced by the Liquid-Ring Vacuum Pump rotating impeller. This pressure holds the liquid ring against the inner wall structure of the pumping chamber. Because the impeller is located eccentric to the pumping chamber, the depth of access of the blades in to the liquid ring reduces and increases as the impeller rotates. This creates increasing cellular quantity on the inlet slot side, creating vacuum.
On the discharge slot side, the impeller cell volume 
decreases as the blades move further into the liquid ring. This escalates the pressure until discharge takes place through the discharge slot.
A continuous flow of refreshing 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 initial stage will not discharge to atmosphere. Instead, the initial stage discharges through the manifold leading to the second stage as well as through a discharge port situated in the intermediate plate between the first- and second-stage impellers.