A liquid band vacuum pump is easy to operate and is utilized in several applications across various industries. A liquid ring pump works together with a sealant Liquid-Ring Vacuum Pump necessary in its procedure. This liquid can be water, oil or any other solvent which is usually rotated by an impeller within the casing of the pump.

As the shaft turns, a liquid ring is established by the centrifugal force produced by the rotating impeller. This force holds the liquid band 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 boosts as the impeller rotates. This creates increasing cellular quantity on the inlet slot side, creating vacuum.

On the discharge port side, the impeller cell volume decreases as the blades move further into the liquid band. This increases 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.
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Regarding the two-stage liquid band pump, the discharge from the 1st stage will not discharge to atmosphere. Rather, the 1st stage discharges through the manifold resulting in the second stage and also through a discharge interface located in the intermediate plate between your first- and second-stage impellers.