A liquid band vacuum pump is easy to operate and can be used in several 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 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 pressure holds the liquid ring against the inner wall structure of the pumping chamber. Because the impeller is located eccentric to the pumping chamber, the depth of entry of the blades into the liquid ring decreases and increases as the impeller rotates. This creates Liquid-Ring Vacuum Pump china 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 band. This escalates the pressure until discharge takes place 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 1st stage does not discharge to atmosphere. Instead, the first 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.