nEXT Mechanical Turbomolecular Pumps

Edwards nEXT mechanical turbomolecular pumps

A turbomolecular pump is a multistage axial-flow turbine in which high speed rotating blades provide compression by increasing the probability of gas moving in the pumping direction. The turbomolecular pump is optimised for molecular flow conditions and requires a suitably sized backing pump to exhaust to atmosphere.   

Exceptional performance from the nEXT range

nEXT has been designed to combine all the latest technological advances in turbomolecular pumps providing end-user serviceability and delivering a truly class leading product.

Pump sizes available offering true 85, 240, 300, 400 and we have now added 700 and 900 litres per second pumping speed performance to our nEXT family(N2).

Conventional turbomolecular pump rotors are designed to deliver either high speed or high compression. To eliminate this compromise the blade arrangements on the nEXT rotor have been totally re-designed to optimise pump performance and achieve both higher speeds and higher compression. The end result is an exceptional pumping performance for a pump of its size.

nEXT85 builds on the ever popular EXT range with increased performance, improved features and benefits, and all in a reduced footprint. Here John Wood, Product Manager Edwards, gives you an introduction to this great new turbomolecular pump.

NEW - nEXT730 and nEXT930 turbomolecular pumps

Edwards are proud to introduce two new additions to the nEXT product family, the nEXT730 and the nEXT930.

With the nEXT730 and nEXT930, Edwards is extending the range of our market leading nEXT platform with two new larger pumps offering speeds significantly over 700 l/s and 900 l/s for nitrogen.


As well as addressing the general R&D market, where faster pumping speeds are sometimes required, these pumps are also designed to meet the requirements of the coating market and other diffuse market sectors such as Heat treatment, Furnace applications, Ebeam welding, Etch, Ion implant, Degassing and Cylinder evacuation.


With over 80,000 tried and trusted nEXT pumps produced we are now bringing higher pumping speeds and increased flexibility to new, more demanding sectors and applications. These new models extend the nEXT’s capability with inlet flange options of ISO / CF 160 and ISO / CF 200, giving pumping speeds of over 900 l/s.

Offering class leading performance along with high reliability and low cost of ownership.

More videos!

Exceptional pumping speeds and compression ratios

superior performance

Huge install base of turbopumps

proven reliability for peace of mind

Bespoke design service available

flexible solutions

Integrated intelligent controls

ease of use

Fully end user serviceable

Extended lifetime and low cost of ownership

Enhanced customer choice

large variety of standard variants

  nEXT85 nEXT240 nEXT300 nEXT400
Inlet flange   DN40 DN63 ISO-K or DN63CF DN100 ISO-K  DN100 ISO-K  or DN100CF DN100 ISO-K  or DN100CF DN160 ISO-K  or DN160-CF
Inlet Pumping Speed ls-1 N2 47 84 84 240 300 400
Ar 44 80 80 230 280 380
He 61 78 80/78 (D/H) 230 340 390
H2 49/44 (D/H) 60/54 (D/H) 60/54 (D/H) 165 280 325
Compression Ratio (D) N2 >1 x 1011 >1 x 1011 >1 x 1011 >1 x 1011 >1 x 1011 >1 x 1011
Ar >1 x 1011 >1 x 1011 >1 x 1011 >1 x 1011 >1 x 1011 >1 x 1011
He 8 x 106/2 x 107 (D/H) 3 x 105 1 x 106 1 x 108
H2 2 x 105/5 x 105 (D/H) 1 x 104 5 x 104 5 x 105
Compression ratio (T/H) N2       >1 x 1011 >1 x 1011 >1 x 1011
He       1 x 106 3 x 106 >1 x 108
H2       1.5 x 104 1 x 105 1 x 106
  nEXT730D nEXT930D
ISO-K 160 CF 160 ISO-K 200 CF 200
Main inlet
pumping speed
N2 ls-1 730 925
He ls-1 820 905
H2 ls-1 715 735
Ar ls-1 665 865
Peak compression ratio from the backing port to the main inlet port
N2 >1x1011 >1x1011
He 1.2X108 1.2X108
H2 4X106 4X106
Ar >1x1011 >1x1011
Ultimate pressure (mbar) (CF) 3.0X10-10 3.0X10-10
Weight (kg) 14.6 19.6 15.4 21.7
Throughput at full speed:
N2 14 14
He 21 21
H2 >14 >14
Ar 3.5 3.5
Explore Our Products & Buy Online