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shirmeyx@dshseals.com
Hydraulic seals, Piston Seals , Oil Seals Manufacturer Supplier for over 20 years .
The A type is a rotary lip seal that features an ID lip that seals dynamically on a shaft and an elastomeric O-ring on its OD to seal statically in a bore. Since the lip is not spring energized, the radial lip contact forces are lower than a rotary metal lip seal, which allows the seal to function at much higher surface speeds (up to 30m/s). The seals are manufactured from a wide variety of PTFE composites and other machinable plastic materials. Standard O-ring choices are nitrile. This broad foundation of standard O-ring and PTFE materials can be tailored to suit nearly all applications.
The most popular fillers for products are graphite, fiberglass/molybdenum disulfide, carbon fiber and mineral.
Graphite Filled
Since graphite is often used as a lubricant, it does not significantly increase the coefficient of friction of PTFE when used as a filler. The low friction allows the compound to be used when both shaft speed and pressure are high. Graphite also is chemically inert which enables its use in corrosive medias
Proprietary Low Wear PTFE
This proprietary filled PTFE offers low wear and friction properties, used in general applications where long life is required. Not recommended for applications with abrasive
media.
Molybdenum Disulfide and Fiberglass Filled
Molybdenum disulfide increases the hardness of the seal surface while decreasing friction. It is normally used in small proportions combined with other fillers such as glass. MoS2 is
also inert towards most chemicals.
Carbon Fiber Filled
Carbon fiber lowers creep, increases flex and compressive modulus and raises hardness. Coefficient of thermal expansion is lowered and thermal conductivity is higher for compounds of carbon fiber filled PTFE. Ideal for automotive applications in shock absorbers and water pumps.
◆◆ PTFE+NBR/FKM
| Material description | Filled PTFE (such as MoS2/Glass fiber, Ekonol and so on), or Virgin PTFE is available, O ring maerial depends on the specific application. |
| Available Color | White, black,yellow, gold etc. |
| Material Strength | Virgin PTFE can meet the requirement of food grade approval. Type A oil seal has single lip, low triction. We can offer you different kinds of material which apply to your specific application. Customized sealing solution is available. |
| temperature | -20~+100℃ |
| Speed | 30m/s |
| Pressure | ≤5 bar |
| Medium | oil, grease. |
| Applied device： | Windmill, pump, compressor, gearbox, engin bearing and other applications. |
E-mail: dshmf@dshseals.com
Skype: dshmf_1
Contact person: Karry Deng
E-mail: clark@dshseals.com
Skype: wan.juan3
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