A liquid band vacuum pump is easy to operate and is utilized in several applications across various industries. A liquid band pump works with a sealant necessary in its procedure. 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 drive holds the liquid ring against the inner wall structure of the pumping chamber. Since the impeller is situated eccentric to the pumping chamber, the depth of entry of the blades in to the liquid ring reduces and increases as the impeller rotates. This creates increasing cell volume on the inlet interface side, Liquid-Ring Vacuum Pump creating vacuum.
On the discharge slot side, the impeller cell volume decreases as the blades move further in to the liquid band. This escalates the pressure until discharge takes place through the 
discharge slot.
A continuing flow of clean sealing liquid is supplied 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. Instead, the initial stage discharges through the manifold resulting in the second stage as well as through a discharge port positioned in the intermediate plate between the first- and second-stage impellers.