Dynamic seals retain or separate fluids, keep out contaminants, and contain pressure. They create a barrier between moving and stationary surfaces in applications such as rotating shafts and pistons rings. Important dimensions for dynamic seals include seal inside diameter (ID), shaft outside diameter (OD), housing bore, axial cross-section, and radial cross-section. Service limits include maximum operating speed and maximum operating pressure. Sealing orientation and direction vary widely. Internal seals fit into a housing bore with the sealing lip in contact with the shaft. By contrast, external seals fit onto the shaft so that the sealing lip contacts the housing bore. Symmetric seals are suitable substitutes for both internal rod seals and external piston seals. Axial seals are used with housing or machine components. For proper sealing, the seal lip on a dynamic seal needs to point towards the medium being contained. |
Products & Services Related to Dynamic Seals
Back-up Rings
Back-up rings or anti-extrusion rings are washer-like devices used to prevent seals from extruding through gaps while under pressure. Seals are installed in the downstream side of the gland.
Bearing Isolators
Bearing isolators are dynamic seals designed to protect bearings from outside contaminants. They are comprised of a rotor (rotating) and stator (stationary) member.
Exclusion Seals
Exclusion seals are comprised of wipers, scrapers and V-ring seals.
Oil Seals and Grease Seals
Oil seals and grease seals have a flexible lip that rubs against a shaft or housing to prevent the leakage or ingress of fluids and dirt.
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