To improve the self-repairing capability of common magnetic fluid seal structures after rupture due to excessive
differential pressure in small clearance conditions and to verify the superiority of diverging stepped
magnetic fluid seals, a diverging stepped magnetic fluid seal device with single magnetic source was tested. The
effect of injection volume, clearance and numbers of teeth on the self-repairing performance of a diverging
stepped magnetic fluid seals was investigated experimentally and compared with a common magnetic fluid seal.
The experimental results indicate that the self-repairing performance of one stepped magnetic fluid seal device
is better. The repair rate of a diverging stepped magnetic fluid seal structure decreases first and then increases
with the increase of injection volume, and a minimum value is reached near the saturation value. The smaller
the sealing gap and the fewer the number of bore teeth, the higher the repair rate of this structure.