Type AR Fluid Couplings are with annular ring and extra long delayfil
During the initial rotation, the annular ring fills up and the working circuit
is partially emptied enabling very low torque transmission during motor
run up (acceleration). This enables very quick acceleration of motor
speed and quick decay of motor current.
This is followed by increase in transmitted torque by gradual emptying of
delayfil chamber oil into the working circuit. The torque is builtup
gradually and enables controlled acceleration torque to the driven
machine. These couplings are very useful for conveyor drives.