Fluid couplings are torque-transmitting couplings that use hydraulic oil or water to transmit power. They differ from torque converters in that the input torque is equal to the output torque (no multiplication of torque). Fluid couplings are much more efficient than torque converters and have typically only 2–4% losses. Fluid couplings are used to provide gentle acceleration control, torque limiting control, load sharing control, and variable torque/speed control. The constant power law still applies, but the power in the driven load is reduced with speed. The difference between the input power and the output power is loss power dissipated in the coupling.
Where are they use fluid couplings?
In general fluid couplings are used in Belt conveyors, Extruders, Centrifuges, Bucket elevators, Ball mills, Crushers, Mixers, Slurry pumps, Compressors, Industrial fans, Feeders, Diesel locomotives, Wagon tipplers, Boiler feed pumps, Reciprocating pumps, Process Pumps, Dryers etc.
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