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About Exclusion Seals
Exclusion seals are primarily used to keep dirt and other contaminants from passing into bearings and other sensitive areas. Some of the devices that fall within the exclusion seals category do not actually have any sealing capabilities. Instead, they serve to wipe or scrape away debris from moving or reciprocating shafts or rods. This helps to protect the seal and extend its life.
Exclusion seals are available in three main configurations, V-ring, wipers, and scrapers.
V-ring seals are all rubber seals used primarily to exclude dirt and other contaminants. V-rings stretch over a shaft and make a seal against the side of a housing or other machine component. Wipers are flexible lip exclusion seals. They are used to wipe contaminants from a shaft. Some wipers also act as seals. Scraper exclusion seals have a scraping edge that maintains contact with the rod regardless of any rod deflection or motion. The lip of the scraper is shaped with a semi-rigid leading edge that removes any contamination from the sealing area. Scrapers have no real sealing capabilities.
When selecting between available exclusions seals, it is important to be aware of both the operating dimensions needed for the seal, and the performance stress to which it will be subjected. Important specifications to consider include the I.D. and O.D. of the exclusion seal and the O.D. of the housing bore to which it will be applied. Other important considerations include the axial cross section and radial cross section of the seal, and finally the gland width into which the exclusion seal will be mounted.
Service limits to consider when working with exclusion seals include the temperature range through which the seals will need to perform, and any fluids with which they may come in contact. Both of these situations bear consideration, as they will help to determine the best material construction for the exclusion seals. Additional concern should be paid to the pressures, vibration or shaft speed, to which the exclusion seals will be subjected, and whether they will be needed in vacuum rated applications.
Products & Services Related to Exclusion 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.
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.
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Exclusion seals, wipers, and scrapers clean the surface of a retracting rod, removing abrasive particles such as dirt, mud, and ice. This protects the seal and extends service life. The importance of wipers cannot be overemphasized. Often a seal fails prematurely because the wiper wears out long...
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