The magnetic powder clutch is based on the electromagnetic principle and the use of magnetic powder to transmit torque. It has a linear relationship between the excitation current and the transmission torque. It can transmit a certain torque regardless of the slip. It has the advantages of pollution, no noise, no shock and vibration, energy saving, etc. Magnetic particle clutch is a multi-purpose and superior automatic control element. However, how to replace sealing ring of water-cooled magnetic powder clutch?