A Liquid-Ring Vacuum Pump china liquid band vacuum pump is simple to operate and is utilized in a number of applications across various industries. A liquid ring pump works with a sealant necessary in its operation. This liquid can be water, essential oil or any additional solvent which is definitely rotated by an impeller within the casing of the pump.
As the shaft turns, a liquid band is established by the centrifugal force generated by the rotating impeller. This power holds the liquid ring 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 boosts as the impeller rotates. This creates increasing cell volume on the inlet interface side, creating vacuum.
On the discharge slot side, the impeller cell volume decreases as the blades move further in to the liquid band. This escalates the pressure until discharge occurs through the discharge interface.
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 along with through a discharge slot located in the intermediate plate between the first- and second-stage impellers.