A liquid band vacuum pump is simple to operate and can be 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, essential oil or any various other 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 push holds the liquid band against the inner wall 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 reduces and boosts as the impeller rotates. This creates increasing cellular Liquid-Ring Vacuum Pump china volume on the inlet port side, creating vacuum.
On the discharge port side, the impeller cell volume decreases as the blades move further in to the liquid ring. This increases the pressure until discharge takes place through the discharge slot.
A continuing flow of new 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 manifold resulting in the second stage and also through a discharge interface positioned in the intermediate plate between your first- and second-stage impellers.