A liquid ring vacuum pump is simple to operate and can be used in several applications across various industries. A liquid band pump works together with a sealant required in its operation. This liquid could be water, 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 
ring is created by the Liquid-Ring Vacuum Pump china centrifugal force produced by the rotating impeller. This force holds the liquid band against the inner wall of the pumping chamber. Because the impeller is situated eccentric to the pumping chamber, the depth of entry of the blades in to the liquid ring reduces and improves as the impeller rotates. This creates increasing cell volume on the inlet slot side, creating vacuum.
On the discharge port 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 interface.
A continuous flow of new sealing liquid is supplied to the pump via the sealing-liquid inlet.
Regarding the two-stage liquid ring pump, the discharge from the initial stage does not discharge to atmosphere. Rather, the first stage discharges through the manifold leading to the second stage along with through a discharge interface situated in the intermediate plate between the first- and second-stage impellers.