A liquid band vacuum pump is simple to operate and is used in a number of applications across Liquid-Ring Vacuum Pump various industries. A liquid ring pump works with a sealant required in its operation. This liquid can be water, essential oil or any various other solvent which is certainly rotated by an impeller within the casing of the pump.
As the shaft turns, a liquid ring is created by the centrifugal force produced by the rotating impeller. This drive holds the liquid band against the inner wall of the pumping chamber. Because the impeller is located 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 port side, creating vacuum.
On the discharge port side, the impeller cell volume decreases as the blades move further 
into the liquid band. This escalates the pressure until discharge occurs through the discharge slot.
A continuing flow of refreshing sealing liquid is supplied to the pump via the sealing-liquid inlet.
In the case of the two-stage liquid ring pump, the discharge from the initial stage does not discharge to atmosphere. Instead, the 1st stage discharges through the manifold leading to the second stage as well as through a discharge interface situated in the intermediate plate between the first- and second-stage impellers.
