A liquid band vacuum pump 
is simple to operate and is utilized in several Liquid-Ring Vacuum Pump china applications across various industries. A liquid band pump works together with a sealant needed in its operation. This liquid could 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 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 access of the blades in to the liquid ring reduces and boosts as the impeller rotates. This creates increasing cellular volume on the inlet slot side, creating vacuum.
On the discharge interface side, the impeller cell volume decreases as the blades move further into the liquid ring. This escalates the pressure until discharge takes place through the discharge interface.
A continuous flow of refreshing sealing liquid comes to the pump via the sealing-liquid inlet.
Regarding the two-stage liquid band pump, the discharge from the 1st stage will not discharge to atmosphere. Rather, the first stage discharges through the manifold resulting in the second stage as well as through a discharge port located in the intermediate plate between the first- and second-stage impellers.