Water-Sealed Liquid Ring

Water Sealed Liquid Ring Vacuum PumpsQ-VAC priming systems using water-sealed liquid ring vacuum pumps are a great choice for priming applications that require the lowest possible maintenance and long-term durability.  This robust vacuum pump technology has been used successfully for both clean water and wastewater applications, however, it is especially well suited for wastewater projects or outdoor installations in warmer climates.  Standard sizes are offered up to 15 HP, however, significantly larger sizes are available.   Water-sealed priming systems are rated up to 29” HgV, however, they are typically operated at lower vacuum levels.  Key advantages of water-sealed liquid ring vacuum pumps include no metal-to-metal contact, only one moving part, almost no routine maintenance, and the ability to ingest water and soft solids without damage.

It is important to note that in order to consider a water-sealed liquid ring priming system you must be able to supply a suitable water source and drain for when the vacuum pump is running.  If a continuous supply of seal water is not available, but liquid ring technology is still preferred, Q-VAC offers closed-loop, air-cooled, liquid ring priming systems sealed with either water or oil.

PRINCIPLE OF OPERATION:  Liquid Ring Technology

In a cylindrical housing, partially filled with sealing fluid, a multi-blade impeller on a shaft is positioned eccentrically.  Port plates with inlet and discharge openings are positioned on either side of the impeller.  A liquid ring is created by the centrifugal force generated by the rotating impeller.  This force holds the liquid ring against the inner wall of the pumping chamber.

Since the impeller is located eccentrically to the pumping chamber, the depth of the blades into the liquid ring decreases and increases as the impeller rotates.  This creates increasing impeller cell volume on the inlet port side, creating a vacuum.

On the discharge port side, the impeller cell volume decreases, as the blades move further into the liquid ring, increasing the pressure until discharge takes place through the discharge port.  A continuous flow of fresh sealing liquid is supplied to the pump through the sealing liquid inlet port.

Liquid Ring Pump at Rest

Liquid Ring Pump Impeller at Rest

Liquid Ring Pump Running

Liquid Ring Pump Impeller Running
Water Sealed Liquid Ring Vacuum Pumps P&ID