Babsl Hydraulic Pump Seal

Babsl Hydraulic Pump Seal

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Babsl Hydraulic Pump Seal

Hydraulic Pump Oil Seals Solutions from China - NNK

Hydraulic Pump Oil Seals keep the lubricating medium in a defined space. They also protect the seal space from dirt, dust and other potentially damaging contaminants. For example, in a high-pressure hydraulic pump operating environment, the entire sealing system consisting of the shaft seal, shaft housing, fluid media and environment determines the required seal function and durability. Therefore, select a product that is easy to replace and install that provides a leak-free seal in a variety of operating environments. This selection should provide a low friction seal, thereby minimizing power loss and heat generation.

Hydraulic Pump Oil Seals are manufactured to strict quality standards and are always under control in accordance with common international specifications. This benefits the user, who is assured of a certain quality and fit, regardless of the manufacturer of the product. For continuity, typical names of oil seals include type, shaft diameter, outside diameter, height and material.


Hydraulic Pump Oil Seal Materials

A wide range of standard materials and an extended range of special materials are designed to handle most conventional oil seal applications. Among the standard seal types, NBR is the most widely used material.

NBR is characterized by good mechanical properties, high abrasion resistance, high tensile strength, low permeability, low compression set and high resistance to petroleum-based oils and fuels, silicone greases, hydraulic fluids, water and alcohols.

NBR is a copolymer of butadiene and acrylonitrile (ACN). The acrylonitrile content can vary from 18% to 50% depending on the application. Low ACN content improves cold flexibility at the expense of oil and fuel resistance. High ACN content increases resistance to oil and fuels while decreasing cold flexibility and increasing compression set. 

For oil seal materials, NNK does not recommend the use of:

- Fuels with high aromatic content, such as jet fuel, diesel, high octane gasoline and gasoline.
- Aromatics, such as toluene, naphthalene, phenanthrene, trinitrotoluene and o-dihydroxybenzene.
- Chlorinated hydrocarbons, such as the insecticide DDT and vinyl chloride, which are produced in large quantities to produce polyvinyl chloride and are produced to produce insecticides, solvents, precursors for various industrial processes, coatings, polymers and synthetic rubber products.
- Non-polar (lipophilic) solvents that dissolve non-polar substances such as oils, fats and greases. Examples include carbon tetrachloride, benzene, ethyl ether, hexane and methylene chloride.
- HFD fluids, anhydrous, synthetically produced and fire resistant.
- Brake fluid DOT 3 (glycol type); ethylene propylene diene monomer (EPDM) rubber is the material of choice for this application.
- Ozone; EPDM, FKM and PTFE recommended

Fluorinated rubber (FKM) is another common material characterized by resistance to ozone, weathering and aging. (e.g. acetic acid). 

Polytetrafluoroethylene (PTFE) is a fluorinated thermoplastic material that has many positive properties for use as a sealing material. These include high heat resistance and virtually unlimited chemical resistance. Compared to NBR and FKM materials, PTFE has the lowest coefficient of friction, making it most suitable for dynamic applications. The oil seal consists of PTFE and a filler. However, PTFE does not have any elastic properties and is usually energized with other complementary materials, such as elastomers or spring steel.

The most important seal materials in this group are:

- NBR (acrylonitrile butadiene). It has good mechanical properties, including abrasion resistance, and can be adapted to different tasks by varying the acrylonitrile content for a temperature range of -20°C to 100°C (-4°F to 212°F).

- FKM can be used even at temperatures up to
FKM is highly resistant to mineral oils and HFD fluids even at temperatures up to 200°C (392°F).

Standard and Special Seal Types

Operating parameters will typically determine whether the application requires a standard or special seal solution. As a rule of thumb, all standard seals are designed for non-pressure applications. If overpressure occurs in the unit to be sealed during operation, check that the vents are clean and open them if necessary, or use special seals designed for high pressure applications. However, standard types can control pressures up to 0.05 MPa (7 psi). 

If the application requires higher than normal pressures, special types and profiles using advanced materials or profiles can be used. hydraulic Pump Oil Seal consists of a shorter, harder seal lip than the standard seal type to prevent increased contact pressure. hydraulic Pump Oil Seal is designed for pressures up to 1.0 MPa (145 psi). The reinforcement ring is pulled down on the shaft diameter to better support the seal lip. The lower flexibility of the seal lip requires tighter tolerances in terms of dynamic runout and deflection. Application limitations depend on shaft speed and diameter.

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