Liquid ring vacuum pumps and compressors

As a leader in vacuum technology, Edwards has developed a portfolio of liquid ring vacuum pumps to meet the demanding applications in process industries. Our liquid ring vacuum pump range include both single and double stage machines. This enables optimum efficiency for processes operating across the vacuum range. Pump capacities up to 40,000 m³/h are available in one stage and 7,500 m³/h in two stage models.

We combine years of comprehensive know-how and innovative technical expertise to develop a revolutionary range of intelligent and connected liquid ring vacuum pumps. We design, engineer, assemble and test bespoke liquid ring vacuum pumps and compressors to your exact requirements and expectations.

How do liquid ring vacuum pumps work?

The pump impeller is mounted eccentrically to the axis of the pump casing, when the impeller is rotated at the appropriate speed and a supply of liquid is introduced into the pump chamber the liquid ring is created concentrically to the pump casing. As the impeller rotates a chamber is formed by the impeller blades and the inside of the liquid ring, as this chamber is open to the suction port gas is sucked into the pump. As the impeller continues to rotate the pumping chamber reduces in size because of the eccentricity the trapped gas is compressed, once the chamber reaches the outlet port the gas is discharged at an increased pressure along with some of the seal liquid which removes the heat of compression.

Benefits of liquid ring pumps

High reliability no small clearances, few moving parts, no internal lubrication
Pumps available with a wide range of pumping capacities
Pumps can operate continuously at any pressure on the pumping speed curve
Excellent for pumping wet vapours and gases
Seal liquid can be selected to be compatible with process vapours, enabling solvent recovery
Available in various materials of construction suitable to pump corrosive gases
Explosion proof standard compliance with limited modification to the pump