A liquid ring vacuum pump is simple to operate and is utilized in a number of applications across various industries. A liquid band pump works with a sealant necessary in its procedure. This liquid can be water, essential oil or any various other solvent which is usually rotated by an impeller within the casing of the pump.
As the shaft turns, a liquid ring is established by the centrifugal force generated by the rotating impeller. This drive holds the liquid band Liquid-Ring Vacuum Pump china 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 cellular volume on the inlet interface 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 occurs through the discharge port.
A continuing flow of new sealing liquid is supplied to the pump via the sealing-liquid inlet.
Regarding the two-stage liquid band pump, the 
discharge from the first stage will not discharge to atmosphere. Instead, the 1st stage discharges through the manifold resulting in the second stage in addition to through a discharge slot situated in the intermediate plate between the first- and second-stage impellers.