A Liquid-Ring Vacuum Pump china liquid ring vacuum pump is simple to operate and is used in several applications across various industries. A liquid ring pump works together with a sealant necessary in its operation. This liquid could be water, 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 band is created by the centrifugal force generated by the rotating impeller. This pressure 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 into the liquid ring decreases and boosts as the impeller rotates. This creates increasing cell quantity on the inlet slot side, creating vacuum.
On the discharge slot side, the impeller cell volume decreases as the blades move further into the liquid ring. This escalates the pressure until discharge occurs through the discharge slot.
A continuous flow of fresh 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 resulting in the second stage in addition to through a discharge port located in the intermediate plate between the first- and second-stage impellers.