A liquid ring vacuum pump is simple to operate and can be used in several Liquid-Ring Vacuum Pump china applications across various industries. A liquid ring pump works with a sealant required in its operation. This liquid can be water, essential oil or any other solvent which can be rotated by an impeller within the casing of the pump.
As the shaft turns, a liquid band is established by the centrifugal force produced by the rotating impeller. This drive holds the liquid ring against the inner wall structure 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 improves as the impeller 
rotates. This creates increasing cell quantity on the inlet interface side, creating vacuum.
On the discharge interface side, the impeller cell volume decreases as the blades move further in to the liquid ring. This increases the pressure until discharge takes place through the discharge slot.
A continuing flow of fresh sealing liquid is supplied to the pump via the sealing-liquid inlet.
In the case of the two-stage liquid band pump, the discharge from the first stage does not discharge to atmosphere. Instead, the 1st stage discharges through the manifold leading to the second stage and also through a discharge interface located in the intermediate plate between your first- and second-stage impellers.