Edwards RV and EM series rotary vane pumps serve overlapping but distinct application ranges. This guide covers the key differences in performance, inlet configuration, maintenance requirements, and service considerations.
Edwards is one of the most widely deployed vacuum pump brands in North American laboratories and industrial facilities. Within their oil-sealed rotary vane lineup, the RV and EM series are the two most common platforms, and the differences between them matter for both initial selection and long-term service planning.
The Edwards RV series (RV3, RV5, RV8, RV12) is designed for laboratory and analytical applications where clean vacuum and low noise are priorities. Key characteristics:
The Edwards EM series (E2M18, E2M28, E2M40, E2M80, E2M175, E2M275) covers the larger-flow, higher-duty-cycle applications common in industrial and process environments. Key characteristics:
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Both series have excellent parts availability through Vactek's authorized Edwards parts supply. The RV series uses a common vane geometry across the range, simplifying stocking. EM series pumps above E2M40 require three-phase power and have significantly higher oil capacities, factor this into maintenance scheduling.
If your application runs intermittently, requires clean vacuum, and operates below 15 CFM, the RV series is the appropriate choice. For continuous-duty applications above 10 CFM with process gas exposure, move to the EM series. When in doubt, Vactek's team can evaluate your application requirements and recommend the optimal model, and source the right OEM parts for either platform.
What to remember from this article
The RV series (RV3,RV12) is designed for laboratory and analytical duty: low noise, compact, NW25 ports, ultimate vacuum to 1.5×10⁻³ mbar.
The EM series (E2M18,E2M275) covers industrial/process applications: higher flow (up to 206 CFM), larger oil capacity, ISO40/63 flanges.
Both series use OEM parts available through Vactek's authorized Edwards distributor relationship.
If your application is above 10 CFM and runs continuously with process gas exposure, the EM series is the appropriate choice.
Reviewed by Vactek Service Team
Factory-trained technicians with 30+ years of field experience
The technical content in this article reflects procedures and standards used daily in Vactek's Fort Lauderdale service facility. We service Edwards, Leybold, Welch, Agilent/Varian, Stokes, and 20+ other brands. This guidance is drawn from real service floor experience.
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