A liquid band vacuum pump is easy to operate and is used in several applications across various industries. A liquid ring pump works together with a sealant necessary in its operation. This liquid can be water, 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 ring is created 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 access of 
the blades in to the liquid ring reduces and improves as the impeller rotates. This creates increasing cellular quantity on the inlet interface side, creating vacuum.
On the discharge port side, the impeller cell volume decreases as the blades move further in to the liquid band. This increases the pressure until discharge occurs through the discharge interface.
A continuing flow of fresh sealing liquid comes to the pump via the sealing-liquid inlet.
In the case of the two-stage liquid ring pump, the discharge from the initial stage will not discharge to atmosphere. Instead, the initial stage discharges through the Liquid-Ring Vacuum Pump china manifold resulting in the second stage as well as through a discharge port positioned in the intermediate plate between your first- and second-stage impellers.