Stopoil Seals and Rings
Oil seals are used to protect shafts and bearings from ingress of dirt and foreign matter and egress of oil or grease. An oil seal generally consists of an outer circular metal part and an inner flexible member that does the actual sealing and is bonded to the metal part by chemical adhesive agents.
The Dynamic Sealing Mechanism or pumping action is how the fluid film created from the Hydrodynamic Effect is maintained without developing a leak.
Dynamic Seals, called expellers, set up an air/liquid interface from centrifugal force at some radius in their passageway that depends on the pressure difference between the stuffing box and discharge pressure that must be overcome. The higher this differential pressure the more beneficial the dynamic seal becomes.
Seals are used to prevent the leakage of fluids in rotating equipment. A seal prevents lubricants, such as oil and grease, from entering the environment and (dirty) water from entering the installation.