Abstract: The feasibility on engineering application of controllability study of mechanical seal is analyzed in theory and practice in this paper. Controllable parameter of mechanical seal includes face temperature, film thickness, friction torque, leakage rate and face pressure. Machinery includes electromagnetic iron, adjustor and fluid drive device, etc. Meanwhile, stationary ring with temperature sensor is complex, inconvenient to be set up and of low reliability in measuring film thickness. Torque sensor can be used successfully in measuring friction torque between main shaft and motor in the non-load mechanical seal test. A mechanical seal control system consisting of mechanical seal, torque sensor, hollow O-ring, signal adjustor, center proc-essor and performer is designed.

Key words: Controllability, Engineering application, Leakage rate, Mechanical seal, Operating life