SLIP STICK S060
An alternating slipping and sticking of the seal faces caused by a poor lubricant between the lapped faces.
Slip stick will cause vibration problems at the seal face unless the vibration is dampened in some manner.
Mechanical seals that use an O-ring as the secondary seal utilize the O-ring as a vibration damper. Metal bellows seals have a problem unless a damper is designed into the product.
The bellows seal damping device is shown in this illustration. In this example the rotating face is allowed to touch the shaft. In other designs, the face holder I.D. is decreased and performs the same function