A liquid band vacuum pump is simple to operate and can be used in several 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 rotating impeller. This push 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 decreases 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 in to the liquid ring. This increases the pressure until discharge occurs through the discharge port.
A continuing 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 initial stage will not discharge to atmosphere. Instead, the initial stage discharges through the manifold leading to the second stage in addition to through a discharge port located in the intermediate plate between the first- and second-stage Liquid-Ring Vacuum Pump impellers.