Information about Dynamic Seals

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About Dynamic Seals

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.

Hydraulic Seals and Pneumatic Seals

Hydraulic seals and pneumatic seals include piston seals, rod seals, U-cups, vee, cup, and flange packings.

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.

Engineering Web: Dynamic Seals - Machine Design

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Compression Seals \| Machine Design Dynamic seals must have good wear resistance to ensure long life. Compression Seals November 15, 2002 Printer-friendly version
Intro and Compression Seals \| Machine Design Dynamic seals must have good wear resistance to ensure long life. Intro and Compression Seals November 15, 2002
Pressure-Energized Seals \| Machine Design Dynamic sealing applications often call for pressure-energized seals.

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