A liquid band vacuum pump is simple to operate and can be used in several applications across various Liquid-Ring Vacuum Pump china industries. A liquid band pump works together with a sealant necessary in its operation. This liquid can be water, essential oil or any various other solvent which is definitely rotated by an impeller within the casing of the pump.
As the shaft turns, a liquid band is created by the centrifugal force produced by the rotating impeller. This power holds the liquid ring against the inner wall of the pumping chamber. Since the impeller is situated eccentric to the pumping chamber, the depth of access of the blades in to the liquid ring decreases and boosts as the impeller rotates. This creates increasing cellular volume on the inlet interface side, creating vacuum.
On the discharge slot side, the impeller cell volume decreases as the blades move further into the liquid ring. This increases the pressure until discharge takes place through the discharge port.
A continuous flow of clean sealing liquid comes to the pump via the sealing-liquid inlet.
Regarding the two-stage liquid band pump, the discharge from the 
initial stage will not discharge to atmosphere. Instead, the first stage discharges through the manifold leading to the second stage as well as through a discharge slot positioned in the intermediate plate between your first- and second-stage impellers.