Industrial Utility Efficiency

Edwards New ELRi Liquid Ring Vacuum Pump

Edwards Vacuum has combined its years of comprehensive know-how and innovative technical expertise to develop a revolutionary range of new liquid ring pumps – the ELRi series. Megha Ajmal, Product Manager for Rough Vacuum products said “made for applications which are wet, humid, as well as corrosive, this product offers a range of features and benefits that will distinguish itself from other competitor pumps in the market.  From the ability to optimize processes to save energy, ELRi complements our range of solutions we offer for the industrial and rough vacuum markets.” 

ELRi liquid ring vacuum pump by Edwards Vacuum.

The technical features are of central importance in this new development. The stainless-steel impeller, endplates, liquid reservoir and heat exchanger makes this pump highly resilient against corrosion and harsh process gases.  The internal injection channels reduce the risk of leakage while the horizontal motor flange arrangement saves precious time on maintenance.  Use of mechanical seals also ensure reliable operation by preventing leaks as well as extending service intervals.  All this state-of-the-art technology is contained in a compact noise cancelling sturdy canopy protecting and extending lifetime of the electronic components.

The ELRi is equipped with not just one but two VSDs.  While the main VSD matches the speed of the pump to vacuum level by adjusting its speed, the second VSD regulates the water flow through the centrifugal pump according to the operating conditions to avoid risks of cavitation.  A patented algorithm always maintains a perfect harmony between the two VSDs ensuring optimal performance.  In addition, it is protected against automatic seizure, so users do not have to worry about the pump failure after long periods of inactivity.

The integrated Air logic controller not only enables the monitoring of important features and parameters of the pump but also offers the option of set‐point control.  This allows users to have a vacuum pump that matches the process demand saving energy.  While the ECOntrol box even allows you to connect and control multiple ELRi pumps, the Icon Box enables smart monitoring and remote controlling ensures optimal servicing to get maximum uptime with your pumps.  Along with this, water consumption is also reduced as the separator is only filled up when required.

The ELRi series comes in a pumping capacity of 750-1050 m3/hr and covers a wide range of applications in the central vacuum, pharmaceutical, plastics, conveying and food applications.  Speaking about the range of pumps offered, Megha Ajmal said “while the standard range of pumps is a perfect solution of general industrial applications, our Heavy‐Duty range is designed with all process wetted parts to be stainless steel.”  All pumps are also fitted with spray nozzles as standard, which are particularly useful for high steam load applications allowing to pump an increased capacity of gas load.”  Moreover, the manual and automatic modes of flushing allow operation in even in the dirtiest applications with minimal downtime.


About Edwards

Edwards is a leading developer and manufacturer of sophisticated vacuum products, exhaust management systems and related value‐added services.  Edwards solutions are integral to manufacturing processes for semiconductors, flat panel displays, LEDs and solar cells.  They are also used within an increasingly diverse range of industrial processes including power, glass and other coating applications; steel and other metallurgy; pharmaceutical and chemical; and for scientific instruments in a wide range of R&D applications.

In 2019, Edwards was celebrating its 100‐year birthday.  The founder, FD Edwards, began by importing vacuum equipment from a small office in South London.  100 years later Edwards has over 6,000 employees worldwide engaged in the research, design, manufacture and support of high technology vacuum and exhaust management equipment. Edwards has state-of-the-art manufacturing and technology facilities in Europe, Asia and the Americas.  For further information about Edwards products please visit