A liquid band vacuum pump is easy to operate and is used in a number of applications across various industries. A liquid band pump works with a sealant needed in its operation. This liquid could be water, Liquid-Ring Vacuum Pump essential oil or any various other solvent which can be rotated by an impeller within the casing of the pump.
As the shaft turns, a liquid band 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. Because the impeller is situated 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 volume on the inlet port side, creating vacuum.
On the discharge interface 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 interface.
A continuous flow of clean sealing liquid comes to the pump via the sealing-liquid inlet.
Regarding the two-stage liquid band pump, the discharge from the first stage 
does not discharge to atmosphere. Rather, the first stage discharges through the manifold leading to the second stage as well as through a discharge slot positioned in the intermediate plate between the first- and second-stage impellers.
