A liquid band vacuum pump is simple to operate and is used in 
a number of applications across various industries. A liquid band pump works together with a Liquid-Ring Vacuum Pump sealant necessary in its procedure. This liquid could be water, oil or any additional solvent which is definitely 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 force holds the liquid band against the inner wall structure of the pumping chamber. Since the impeller is located eccentric to the pumping chamber, the depth of access of the blades in to the liquid ring decreases and raises as the impeller rotates. This creates increasing cellular volume on the inlet slot side, creating vacuum.
On the discharge interface side, the impeller cell volume decreases as the blades move further into the liquid band. This increases the pressure until discharge occurs through the discharge port.
A continuing flow of clean 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 first stage will not discharge to atmosphere. Instead, the first stage discharges through the manifold leading to the second stage and also through a discharge interface located in the intermediate plate between the first- and second-stage impellers.