Go to GlobalSpec.com Home
 

Alert   Product Alerts
Keep current on the latest products, new suppliers, and technical articles of interest to you. (See Topics)

Mechanical Seals

Find Mechanical Seals Manufacturers

Find Mechanical Seals by Specification:
More Specifications >>

About Mechanical Seals

Mechanical seals are designed to prevent leakage between a rotating shaft and its housing under conditions of extreme pressure, shaft speed and temperature.  Mechanical seals can be single acting or double acting.  Single (acting) mechanical seals have one sealing gap. The lubrication film required by the sliding seal faces is provided by the medium to be sealed.  The lubrication film required by the seal faces in double (acting) mechanical seals is provided by a higher pressure buffer medium (sealant liquid) that is compatible with the pumped product. The sealant liquid is at a higher-pressure so that any leakage across the seal faces will be the sealant liquid into the pumped product. This buffer serves to separate the product and the atmosphere.  Seal design choices include pusher, metal bellows, and elastomeric bellows.  A pusher mechanical seal utilizes a dynamic secondary seal or o-ring that is responsible for sealing the fluid path between the pump shaft and the inside diameter of the rotating seal face. The secondary seals move axially along a shaft or sleeve to maintain contact at the seal faces, compensating for seal face wear and for any seal wobble due to misalignment.  Metal bellows design is a non-pusher seal design. The secondary seal in a non-pusher design does not have to move along the shaft or sleeve to maintain seal face contact. The bellows itself provides the necessary spring loading for seal face contact. Metal bellows provide effective sealing in a wide range of temperatures and use no elastomers.  An elastomer bellows seals is a non-pusher seal design in which a single spring coil fits over the shaft and bellows.

Other important design parameters to consider for mechanical seals include spring configuration, shaft mounting, and seal configuration.  Spring configuration can be single or multi.  Single springs are sometimes called "monocoil" or "single coil" design. This type of seal uses a large spring cross section that resist corrosion. Its chief limitations are its tendency to distort at high surface speeds, the large axial and radial space it requires and the need to stock a different size spring for each seal size.  Multiple small springs are not as susceptible to distortion at high speeds as are single coil springs and they consequently exert an even closing pressure on the seal ring at all times.  Shaft mounting choices include cartridge unit, noncartridge, split seal (fully split), and semi-split seal.  The seal can be tandem, face-to-face, back-to-back, or concentric.

More >>

Other Topics You Might Be Interested In

  • Hermetic Sealing with Laser Technology
    Conventional hermetic sealing methods of the past - epoxies, solder seals and mechanical seals - cannot fulfill the microwave electronics requirement of 100% protection against moisture. Many...
    (read more)
  • Revolutionary New Seals Built to Last in Abrasive Environment
    When Randy Webb called one of his chemical plant customers in northern Ohio recently, the JNO. J. Disch Company sales engineer thought he might have a new solution to a nagging problem at the...
    (read more)
  • Balanced Seals
    Balanced seals are designed so that the effective contact presure is always less than the fluid pressure, reducing friction at the seal faces. The result is less rubbing wear, less heat generated and...
    (read more)

Engineering Web: Mechanical Seals

Pages: 1 - 3 of 490

Mechanical Seals Information | Business.com
Mechanical Seals Home » Directory » Industrial Goods &
See Business.com, Inc. Information
ISA | Mechanical Face Seals, Troubleshooting & Installation
Mechanical Face Seals, Troubleshooting & Installation
See International Society of Automation Information
Mechanical Seals
Mechanical Seals Daemar delivers a range of Mechanical Seal solutions from the standard Types A, B, C, D and E
See Daemar Inc. Profile & Catalog
More >>

Part Numbers for Mechanical Seals

Part # Distributor Manufacturer Product Category Description
2ZPK6 Grainger Industrial Supply DANAHER TOOL Suspension Tools Seal Puller,Removes Oil and Grease Seals
2KYT5 Grainger Industrial Supply BALDWIN FILTERS Oil, Air, and Fuel Filters Air Filter,Element/Radial Seal

More >>
View Specifications
Supplier Data Sheets
Mechanical Components Home