×

Subscribe to our mailing list

Get a Physical Copy Mailed to You

NDA SHIPPING ON ORDERS RECEIVED BY 1PM EST 720.209.9933

12516 HUDSON WAY, THORNTON, CO 80241

logo

logo
  • About Us
  • Sealing Products
  • Engineering Specs
  • Seal Finder
  • Contact Us
  • Get a Quote

General Rotary Seal Information

How Radial Shaft Oil Seals Work

The area between the sealing edge and the shaft is the most important. The sealing effect is achieved by pre-loading the sealing lip, making its internal diameter slightly smaller than the shaft diameter. The garter spring ensures constant mechanical pressure and maintains the radial force to the shaft, flattening the sealing edge to defined width. Sealing is provided by the surface tension of the hydrodynamic oil film between the seal flattened area and the shaft. Oil thickness must be between 1 and 3 um to avoid leakage. The meniscus acts as an interface between the outside air and the fluid. Any break in the meniscus will result in leakage. This can occur if the shaft contains scratches along the seal path.

radial-spring-pressure

 

 

The Metal Case

The metal insert or case is used to give strength and rigidity to the seal. Normally, it is made of cold rolled steel. To avoid rust or chemical attack, stainless steel may be used.  Available in 302, 304, or 316 stainless.

 

The Garter Spring

The garter spring maintains the radial force exerted by the sealing lip around the shaft surface. Normally produced in cold rolled steel. For special applications, stainless steel may be used.  Available in 302, 304, 316 stainless

  • General Information
    • General Rotary Seal Information
    • Shaft Seal Installation
    • Shaft Seal Type Interchange Table
    • Standard Shaft Seal Types
  • Tolerances Information
    • Bore Specs Tolerences
    • Shaft Specs Tolerances
    • Press-Fit Specs Tolerances
  • Materials Information
    • General Materials Information
    • Material Fluid Compatibility
    • Case and Spring Materials
  • Shaft Information
    • Shaft Eccentricity
    • Rotary Seal Permissible Shaft Speed
    • Permissible Shaft Pressure

Contact Us

  • 12516 Hudson Way, Thornton, CO 80241
       720.436.8322
       info@ddsseals.com

Product Info

    DDSSEALS Warranty

    About Us

    Sealing Products

    Engineering Specs

    Seal Finder

    Contact Us

Connect With us

  •  
  •  
  •  
  •  
© 2023 DDSSeals. All Rights Reserved. Powered By OnlineStir     Privacy Policy | Terms of Use | FTC Disclosure
Translate »
MENU logo
  • About Us
  • Sealing Products
  • Engineering Specs
  • Seal Finder
  • Contact Us
  • Get a Quote