your best partner for vacuum


The EVR-series are robust Vacuum Roots Booster Pumps

These Roots pumps are excelent tools to boost up your pumping speed and the reach a much better ultimate vacuum. These EVR-series Roots pump are useally combined with the pre-vacuum pumps of the following series: EV-series, EVD-series, EVSW-series and EVSL-series. The pumps can be supplied with two options: the bypass system and valve, this bypass system allows the Roots pump to be started already at atmosphere at the same time as the pre-vacuum pump. Teh second option is the magnetic drive, this magnetic drive eliminates allows the pump to run without a shaft seal, so it reduces downtime and service costs. Due to the lower ultimate vacuum the pump is oftenly used in applications like:

  • Vacuum packaging
  • Vacuum metallurgy
  • Thin film coating
  • Spae simulation
  • Freeze drying
  • Vacuum impregnation
  • Low density wind tunnels
  • Vacuum distillation
  • Drying and de-gassing

Part Number

Ordering information Art.No.
EVR-250; 3 phase; 230V; 50/60Hz 661001
EVR-250B (with bypass); 3 phase; 230V; 50/60Hz 661011
EVR-250M (with magnetic drive); 3 phase; 230V; 50/60Hz 661021
EVR-250BM (with bypass and magnetic drive); 3 phase; 230V; 50/60Hz 661031


Specification Unit 50 Hz 60 Hz
Nominal displacement m3/h 250 300
Ultimate vacuum mbar 3×10-4 3×10-4
Delta P of the relieve valve mbar 50 50
Motor power kW 1,1 1,1
Nominal speed rpm 2825 3400
Type of protection IP 55 55
Oil filling for the gearbox ltr 0,8 0,8
Weight (B/M/BM version) kg 89(100/95/106) 89(100/95/106)
Noise level dB 69 71
Connection inlet DIN 80/63 80/63
Connection outlet DIN 63 63


Accessoires Art.No.
Adapter set for ISO-K flanges; Inlet DN 63 ISO-K 661701
Adapter set for ISO-K flanges; Outlet DN 63 ISO-K 661702


Consumables Art.No.
Sealing kit for EVR-250 661901
Sealing kit for EVR-250B 661911
Sealing kit for EVR-250M 661921
Sealing kit for EVR-250BM 661931
Maintenance kit for the EVR-250 661902
Maintenance kit for the EVR-250B 661912
Maintenance kit for the EVR-250M 661922
Maintenance kit for the EVR-250BM 661932
Standard oil filling 1 ltr 100400

Pumping speed curve




Dimensions (mm) L0 L1 L2 L3 L4 H1 H2
EVR-250 730 210 155 450 15 300 50
H3 W1 W2 W3 4-ØC
130 220 270 165 4-Ø14