Rebuilt BOC Edwards EXT Turbo Pumps

EXT
ModelRebuilt
EXT70 $2,400
EXT70H ask
EXT70CF ask
EXT250 ask
EXT250H $3,700
EXT250HI $3,700
EXT255H $3,900
EXT255HI $3,900
EXT260 ask

EXT Specifications

BOC Edwards small EXT 70 uses a magnetic upper bearing and a ceramic lower bearing. In the EXT250M the rotor is entirely supported by magnetic bearings and can be mounted in any orientation. In the EXT70H the letter H signifies compound molecular: combined bladed turbomolecular stages with molecular drag stages on the same rotor.

EXT Turbo Pump250M255H
Inlet flangeDN100ISO-K or DN100CF
Outlet flangeDN25NW
Pump speed (l/s)
N2 240220
He250230
H2 190180
Compression ratio
N2 >1 x 108
He2 x 104 4 x 105
H2 15001.6 x 104
recommended backing pumpRV5RV3
Max. continuous inlet pressure (water/air cooling)3 x 10-1 / 3 x 10-2 2 x 10-1 / 2 x 10-2
Nominal Rotation speed (rpm)60,000
Standby rotation (rpm)42,000
Cooling methodFree convection or forced air, or waterForced air or water



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