Information about Oil Seals and Grease Seals

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About 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. For proper installation, the seal lip should point towards the medium being contained. Some oil seals and grease seals have a spring to help keep the lip in contact with the shaft. The sealing orientation and direction is important to consider for oil seals and grease seals. The orientation and direction can be internal or rod seal, external or piston seal, symmetric seal, or axial seal. Rod seals are radial seals. The seal is press-fit into a housing bore with the sealing lip contacting the shaft. Also referred to as a shaft seal. Piston seals are radial seals. The seal is fit onto a shaft with the sealing lip contacting the housing bore. V-rings are considered external lip seals. A symmetric seal is symmetrical and works equally well as a rod or a piston seal. An axial seal seals axially against a housing or machine component.

Products & Services Related to Oil Seals and Grease 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.

Dynamic Seals

Dynamic seals include oil seals, hydraulic and pneumatic seals, exclusion seals, labyrinth seals, bearing isolators, and piston rings. They create a barrier between moving and stationary surfaces in applications such as rotating shafts and pistons rings. This is a general search form; more detailed search forms are available.

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.

Engineering Web: Oil Seals and Grease Seals - Machine Design

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Felt Seals \| Machine Design Unlike lip seals and squeeze packings, felt seals require relative little shaft pressure to function effectively.
Squeaks happen: A little grease might do the trick \| Machine... The grease consists of a new, high-viscosity base oil, lubricious thickening ingredients, and extreme pressure and antiwear additives.
Machine Design \| Felt Seals Felt Seals November 15, 2002

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