A liquid ring vacuum pump is easy 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, oil or any other solvent which is definitely rotated by an impeller within the casing of the pump.
As the shaft turns, a liquid band is created by the centrifugal force generated by the rotating impeller. This drive 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 decreases and improves as the impeller rotates. This creates increasing cell quantity on the inlet port side, creating vacuum.
On the discharge slot side, the impeller cell volume decreases as the blades move further into the liquid band. This Liquid-Ring Vacuum Pump china increases the pressure until discharge occurs through the discharge slot.
A continuing flow 
of clean sealing liquid comes to the pump via the sealing-liquid inlet.
Regarding the two-stage liquid ring pump, the discharge from the 1st stage will not discharge to atmosphere. Rather, the initial stage discharges through the manifold leading to the second stage as well as through a discharge interface positioned in the intermediate plate between the first- and second-stage impellers.