A steam turbine is a type of turbine. It consists of a rapidly rotating shaft equipped with many turbine blades that are driven by steam.

Backpressure extraction steam turbine Naturenergie Cham (Gammel Engineering)
Standardized designations
According to DIN, a distinction is made between the following designations:
- Steam turbine: It is the pure power machine with the rotating components,
- Steam turbine set: In addition to the steam turbine, it consists of the connected working machines and, if necessary, a gearbox,
- Steam turbine unit: This refers to the entirety of the steam turbine, driven machine, condenser and connected piping.
Other designations
- According to the direction of flow: axial turbine and radial turbine
- According to the working process: action turbine (reduction of the enthalpy drop on the guide vanes) and reaction turbine (reduction of the enthalpy drop on the guide vanes and the rotor blades)
- After the steam condition: hot steam, wet steam turbine and high-pressure, medium-pressure and low-pressure turbine
- After the steam supply: Pure steam, exhaust steam and storage steam turbine
- After steam removal: condensation, extraction condensation and backpressure turbine
Source : Wikipedia http://de.wikipedia.org/wiki/Dampfturbine