The key principle in modern power generation is efficiency. The GSS transmission is in wide use around the world, and many power plants are taking advantage of the low power consumption, long machine life, and easy maintenance that these units offer. These transmissions provide a significant increase in power production compared to conventional valve-controlled feed water systems. The GSS features a variable speed fluid coupling and a step-up gear in a single closed casing, and offers stepless speed operation in an extremely compact design.
Fluid couplings are subject to severe stress, due to their high speed and great-transmitted power.
The rotors are made from high tensile strength forged material and are machined and finished by electrolytic processing. The step-up gears are the single helical single stage type and are finished ground to the highest accuracy. All rotating parts are statically and dynamically balanced to eliminate vibration and noise. The Hitachi fluid coupling Model GSS consists of a variable speed fluid coupling and the gears are housed together in a closed casing. The speed of the motor is first increased by the step-up gear until it almost equals the speed of the driven machine and the fluid coupling is rotated at this speed.