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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.
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Hydraulic Balance
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Important Considerations for Selecting O-rings
In any sealing application, correct O-ring selection is the result of a number of design considerations including dimensions, chemical compatibility and the ability to resist pressure and temperature...(read more)
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Important Considerations for Selecting O-rings
In any sealing application, correct O-ring selection is the result of a number of design considerations including dimensions, chemical compatibility and the ability to resist pressure and temperature...(read more)
Engineering Web: Mechanical Seals
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Process Pump & Seal Training - Process & Industrial Training... Mechanical Seals Process Accessories The PITT Store Volume 3 - Packed Stuffing Boxes & Mechanical Seals See Iglou Internet Services, Inc. Information |
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Mechanical Seals : products of India Mechanical Seals : Products review, product catalog of Mechanical Seals from India |
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ISA | Home Mechanical Face Seals, Troubleshooting & Installation See International Society of Automation Information |
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 |
| 2KZP9 | Grainger Industrial Supply | BALDWIN FILTERS | Oil, Air, and Fuel Filters | Air Filter,Element/Radial Seal Outer |
| 2LAA8 | Grainger Industrial Supply | BALDWIN FILTERS | Oil, Air, and Fuel Filters | Air Filter,Element/Radial Seal Outer |
| 2KYU9 | Grainger Industrial Supply | BALDWIN FILTERS | Oil, Air, and Fuel Filters | Air Filter,Element/Radial Seal Outer |
| 2KYD7 | Grainger Industrial Supply | BALDWIN FILTERS | Oil, Air, and Fuel Filters | Air Filter,Element/Radial Seal Outer |
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