Edwards Vacuum A34315904 E1M18 One Stage Rotary Vane Pump, Oil-Sealed, 100/200V, 1-ph, 50Hz or 100-105/200-210V, 1-ph, 60Hz

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Medium EM series pumps are rugged mechanical oil-sealed pumps with speeds of 18and 28 m3/hr. Compact and quiet, they feature advanced lubrication circuits, high reliability, and accessories to suit specific application needs. 

Technical Data 

Displacement (50Hz)20.5 m3h-1 /
 12.1 ft3min-1
Displacement (60Hz)25.0 m3h-1 /
 14.7 ft3min-1
Speed (Pneurop 6602) 
50Hz17.0 m3h-1 /
 10 ft3min-1
Speed (Pneurop 6602) 
60Hz20.4 m3h-1 /
 12.1 ft3min-1
Ultimate vacuum (total pressure) 
without gas purge3 x 10-2 mbar /
 2.2 x 10-2 Torr
with gas purge6.5 x 10-1 mbar /
 4.8 x 10-1 Torr
with Fomblin®3 x 10-1 mbar /
 2.56 x 10-2 Torr
Inlet connectionNW25
Outlet connection**Nozzle 15 mm external Ø removable from 3/4 in BSP tapped hole
Max permitted pressure at outlet0.5 bar gauge /
 7 psig
Max inlet pressure50 mbar /
for water vapour38 Torr
Max water vapour pumping rate0.65 kg h-1
Operating temp range13-40°C
Nominal Rotation speed 50/60Hz1440/1720 rpm
Power connector 1-ph*IEC EN60320 C19
Motor power 50 Hz0.55 kW
Motor power 60 Hz0.75 kW
Weight37 kg / 82 lbs
Noise @ 50Hz57 dB(A)
Oil capacity - max1.4 litre
Oil capacity - min0.9 litre
Recommended oil (supplied)Ultragrade 19

* Pumps listed with IEC connector only

** The FX are supplied with NW25 outlet connection

Call 01463 830401 For Any Assistance


The EM range of oil‑sealed rotary pumps – renowned for their high ultimate vacuum, rapid pumping speed, quiet operation and ability to handle vapour – have become the industry standard for laboratory and light industrial applications. The pump is a freestanding unit with the drive provided through a flexible coupling by either a single‑phase or three‑phase (four pole) motor.

Each EM pump is supplied with 1 litre of Ultragrade 19 oil, O ring and centering ring, two Allen keys and spares seal for oil drain and filter plugs. For PFPE prepared FX pumps Fomblin® to be ordered separately.

Features and Benefits

The pump is designed for reliable, long‑term operation.
Thermal overload device prevents overheating (single phase only).
The drive is provided through a flexible coupling by a single‑phase or three‑phase (four pole) motor.
The motors are totally enclosed and are cooled by the motor cooling fan.
Full height O ring sealed oil sight glass for easy checking of oil level and condition.
Large sight glass and operating oil range.
IE3 energy efficient 3 phase motor used with E2M28.


This is a single stage oil sealed rotary vane pump which has a pressurised oil system that lubricates the pump shaft bearing surfaces and rotor sealing faces. The pump has an oil distribution valve which prevents discharge of oil to the pump interior (suckback) after the pump stops. The pumping chambers are air-tight, so this arrangement prevents oil suckback unless the gas ballast valve is open.

You can inspect the level and condition of oil in the oil box reservoir through the oil sight-glass. An oil filler-plug is fitted to the top of the oil box. The pump has an oil drain-plug to allow either gravity oil drain or pressure oil drain.


Analytical instruments
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Research and development
Backing Turbomolecular pumps
    • SKU
    • Commodity Codes
  • ATEX Rated
  • Oil Sealed
  • Vacuum Peak Pumping Speed m3 h-1 @ 50Hz
  • Vacuum Peak Pumping Speed cfm @ 60Hz
  • Ultimate pressure w/o gas ballast - 50mBar
  • Ultimate pressure w/o gas ballast 60Torr
  • Manufacturer
    Edwards Vacuum
  • Country of Origin
    Czech Republic