Contact us
Matej Pospisil
Matej Pospisil
Matej Pospisil
Sales Department | Cryogenics
Cryogenic Turboexpanders


PBS Turboexpanders are primarily designed for the expansion of gases such as helium, hydrogen, nitrogen, argon, air, etc., in a gas liquefier.

  • Easy regulation
  • High efficiency
  • Rotor placement on gas-dynamic bearings
  • Long-term and trouble-free operation
  • Turboexpanders HEXT / CTE 100, HEXT / CTE 200, HEXT / CTE 300 
PBS has a long history in the field of cryogenic technology, with its first product on the market being the small cryogenic turbine (HEXT 0.5). Since then we have developed additional turboexpander models and have made and distributed hundreds of turboexpanders to our customers and partners, all major players in the field of cryogenic technological processes, with exceptional results.
An expansion turbine, also known as a turboexpander, is one of key parts in the cryogenic technological processes. PBS expansion turbines are designed to be used for the expansion of hydrogen, helium, nitrogen, argon and others during the processes of gas liquefaction. These devices are either centrifuges or axial-flow turbines, instrumental in creating work from pressurized gas to be used to drive a compressor or generator. 

The extracted gas heat energy is transformed into the mechanical energy of the shaft in the turbine through the turbine wheel. This mechanical energy is then transformed into thermal energy via an integrated turbine brake, which is then drained out of the turbine by means of a coolant.

PBS turboexpanders have a unified design that makes it possible to quickly respond to customer requirements for various input and output parameters of the expanding gas.

The main advantage of PBS turboexpander is the very easy and precise speed control with the turbine brake, as well as their long-term trouble-free and maintenance-free operation thanks to the placement of the rotor on gas-dynamic bearings.

Main paramters of cryogenic turboexpanders   

Main parameters of turboexpanders HEXT/CTE 100  HEXT / CTE 200 HEXT / CTE 300
Cooling power 0.1 - 3 kW 2 - 16 kW 10 - 100 kW
Mass flow** 4 - 150 g/s 150 - 600 g/s 300 - g/s
Max RPM 360,000 180,000 100,000
Max. Inlet pressure 1.8 Mpa 2.8 Mpa 5 Mpa
Inlet temperature 6 - 150 K 6 - 150 K 6 - 150 K
Impeller diameter 9 - 20 mm 20 - 50 mm 30 - 100 mm
Bearing Types Aerodynamic Aerodynamic Aerodynamic
Turboexpander configuration Eddy current brake Eddy current brake / Generator* Generator* / Compressor*

Brochure to download here.

Why us?

Experience with various working gases

Experience with various working gases

PBS cryogenic compressors are used in research and industry in processes for the liquefaction of helium, nitrogen, argon, etc.
Years of experience and high success rate

Years of experience and high success rate

Since development started in 1986, PBS has designed and built hundreds of cryogenic turbines. Our HEXT 0.5 was sold 270 times between 1986 and 1992. It's successor HEXT 1.5 was sold 56 times between 1995 and 2003. This model is still in production today. The next generation HEXT 2 has been made and delivered 36 times in the early 2000s. In the last few years, production is back up and we have sold over 20 expansion turbines since 2017.

Cryogenic technology services

PBS provides direct and indirect support for all of its cryogenic products during installation, commissioning and after-sales service.

Our efforts can be seen having a large impact on many fields, such as the medical field through magnetic resonance, tissue and organ preservation, and liquid gases; in the field of research with particle accelerators, laser research, superconductivity, superfluidity and low temperature research itself; space, where liquefied gases serving as fuel, as well as in space research; and also in mechanical engineering for the low-temperature stabilization of components, cooling of workpieces with liquid nitrogen among others.

Our services to our customers include not only the supply of such products, but also servicing of these parts, the majority of which occurs in the customer's facility, if necessitated. We also offer professional technical training for service personnel.