A liquid band vacuum pump is simple to operate and can be used in several applications across various industries. A liquid band pump works with a sealant required in its procedure. This liquid could be water, oil or any various other solvent which can be 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 drive holds the liquid ring against the inner wall of the pumping chamber. Because the impeller is located eccentric to the pumping Liquid-Ring Vacuum Pump china chamber, the depth of entry of the blades in to the liquid ring decreases and improves as the impeller rotates. This creates increasing cell quantity on the inlet port side, creating vacuum.

On the discharge interface side, the impeller cell volume decreases as the blades move further in to the liquid band. This increases the pressure until discharge occurs through the discharge port.

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 ring pump, the discharge from the initial stage does not discharge to atmosphere. Instead, the first stage discharges through the manifold leading to the second stage in addition to through a discharge interface located in the intermediate plate between the first- and second-stage impellers.