What are the advantages hydraulic coupling

By liquid fluid coupling with the pump wheel, turbine blades interaction of the change in angular momentum transfer torque .Its output torque equal to the input torque minus the friction torque, so that its output torque is less than the input torque constant . Fluid coupling between the input shaft and the output shaft by liquid contact , working member does not exist between the rigid connection.Hydraulic pipe fittings  eliminates shock and vibration ; output speed lower than the input speed , two -axis speed difference with the increase of the load ; overload performance and good starting performance , the load is too large and can still be stopped when the input shaft rotation , does not cause damage to the power machine ; when the load decreases, the output shaft speed increases until close to the input shaft speed, the transmission torque to zero.