Dynamic mechanical seals (unbalanced)
In the dynamic design the spring elements are located in the rotary part of a mechanical seal system. In this design the manufacturing tolerances of the different mechanical seal and pump components have to be compensated by the spring. That means: in the case of a pump than runs for 24 hours at 3000 rpm, up to 8.6 million axial tumbling movements are triggered. A dynamic mechanical seal can thus damage the surface of a shaft and should only be used in conjunction with shaft sleeves.