German borflex seals borflex models borflex prices

borflex seals are typical representatives of oil seals; the term "oil seal" generally refers to skeleton oil seals. The function of an oil seal is generally to isolate components requiring lubrication in transmission parts from the external environment, preventing lubricating oil leakage. The skeleton acts like reinforcing steel in concrete components, providing reinforcement and enabling the oil seal to maintain its shape and tension. According to structural form, they can be divided into single-lip skeleton oil seals and double-lip skeleton oil seals. The secondary lip of a double-lip skeleton oil seal serves as a dust seal, preventing external dust, impurities, etc., from entering the machine interior. According to skeleton type, they can be divided into internally covered skeleton oil seals, externally exposed skeleton oil seals, and assembled oil seals. According to operating conditions, they can be divided into rotating skeleton oil seals and reciprocating skeleton oil seals. Used in gasoline engine crankshafts, diesel engine crankshafts, gearboxes, differentials, shock absorbers, engines, axles, and other locations.

borflex seal types

1) Compression seals: Compression seals, especially O rings, have always been widely used in sealing applications. Other forms such as X type, T type, D type, square, triangular, etc., are suitable for different applications. The direction of improvement is to make their sealing performance stable and reliable, increase their pressure resistance, and reduce friction. They can also form combination seals with low-friction plastics such as PTFE and nylon slide rings and support rings. This increases pressure resistance and reduces friction. Some manufacturers' products are permitted to reach speeds of 7.5m/s and sealing pressures of 5.6MPa. 2) Reciprocating lip seals: Reciprocating lip seals, also known as lip gaskets or cups, are widely used for dynamic sealing in hydraulic system reciprocating cylinders. The pressure-bearing surface of this seal is lip-shaped; during installation, there is a very small interference fit, allowing the lip edge to fully contact the sealing surface to create a seal. When the cylinder operates, as pressure rises, the contact force and contact area increase, thereby improving sealing. During the cylinder return stroke, pressure drops, and the contact area and friction are lower than during the working stroke, creating a breathing action that lubricates the lip. There are many types of reciprocating seals, commonly including J type, L type, U type, V type, and Y type. There are also various combination and composite seals, such as U-cup, V-ring, and multi-lip seals. Extrusion must be prevented under high pressure by selecting materials with sufficient tear strength, hardness, and modulus, or by using support rings for protection, or by using reinforced elastomers. Seals used under high pressure, high speed, or high temperature often use composite combination seals. Their common feature is having two lips in contact with the cylinder wall. A groove is provided in the middle of the sealing area to store medium, improving lubricity, resulting in less lip wear and reliable sealing. Lip seals used in pneumatic systems are required to operate without oil lubrication; contact pressure varies, and some integrate dust wipers with the seal structure. 3) Rotating shaft lip seals: There are no fewer than 200 varieties of similar structures. Examples include hydrodynamic type, internally covered skeleton, assembled type, externally exposed skeleton, PTFE-bonded AF type, dual-modulus return flow type, etc. The advantage of the externally exposed assembled type is accurate positioning, high concentricity, and good heat dissipation conditions. It remains stable under pressure and vibration, resulting in a longer service life while saving rubber material. The dual-modulus return flow type applies wave seal theory; by adding a low-modulus, easily deformable material at the sealing contact point, a return flow effect is achieved, simultaneously reducing product design and mold processing costs. Joints between rigid waterproof layers and gable walls, parapet walls, and protruding roof structures should all be properly treated (with flexible sealing).

borflex seal influencing factors

Hydraulic seals play a crucial role in the integrity of hydraulic and pneumatic systems. If the seals of a hydraulic or pneumatic component are inadequate, the component itself is not considered a good product. Many factors affect seals. First, pressure is a significant factor influencing seal quality; the magnitude of pressure and the duration of pressure cycles greatly impact seal damage (such as extrusion). The higher the pressure, the greater the influence of other factors on seal performance, such as temperature, speed, seal material, clearance between piston and cylinder barrel, and clearance between piston and cylinder head. Another factor is temperature and friction. It is difficult to describe the maximum and minimum operating temperatures for a seal material because this is the result of a combination of factors. Operating temperatures for pistons and piston rods differ, so they must be selected accordingly. Another factor is the surface roughness of the seal product; surface characteristics, pressure, medium, temperature, seal material, seal type, and motion speed are all factors affecting seals. The last factor is surface treatment. Experience shows that the surface characteristics of cylinder pistons and piston rods have a significant impact on seal life. Surface characteristics are commonly defined by the RA value, where RA is the arithmetic mean of the absolute values of surface profile deviations from the centerline. However, these values do not fully represent the impact of surface conditions on seals, because even at the same roughness, different surface shape characteristics can lead to varying degrees of seal wear.

borflex seal troubleshooting

1) Main factors causing oil seal leakage: Poor sealing of the oil seal is the primary factor causing leakage. When the shaft wears and forms grooves, even replacing it with a new oil seal may not achieve proper sealing. This is due to reduced contact pressure between the oil seal lip and the shaft, resulting in insufficient interference between the installed oil seal lip diameter and the shaft diameter. Taking the crankshaft oil seal of the S195 diesel engine as an example, the main reasons for poor sealing are analyzed as follows: (1) Poor manufacturing quality of the oil seal; (2) Poor quality of the shaft or bearing; (3) Improper use and maintenance; (4) Improper installation; (5) Improper storage, leading to adverse effects from environmental contamination. 2) Countermeasures for leakage due to poor oil seal sealing: Acquire basic knowledge to identify inferior products and purchase high-quality, standard-compliant oil seals. During installation, if the outer surface of the shaft diameter has low roughness or defects such as rust spots, corrosion, or burrs, polish it smooth with fine sandpaper or an oil stone. Apply clean engine oil or lubricating grease to the oil seal lip or the corresponding position on the shaft diameter. Apply sealant to the outer ring of the oil seal. Wrap the keyway area on the shaft with hard paper to avoid scratching the oil seal lip. Use a special tool to rotate and press the oil seal inward. Never hammer or force it, to prevent deformation of the oil seal or breakage of the spring, which would cause failure. If lip flipping, spring detachment, or oil seal skewing occurs, it must be removed and reinstalled. Note: Do not arbitrarily tighten the inner spring when the shaft diameter is not worn and the oil seal spring tension is sufficient. Oil seals used in machinery generally operate under harsh conditions, with large environmental temperature differences, abundant dust, and frequent vibration causing constantly changing stress on components. Therefore, frequent inspection, maintenance, and upkeep are required. If the shaft diameter and bearing are severely worn, or if the oil seal rubber is aged or the spring has failed, repair and replace the corresponding parts promptly. Troubleshoot abnormal heating in components or assemblies immediately. Avoid overspeeding or overloading the machinery to prevent increased temperature at the oil seal lip, rubber aging, and premature lip wear. Regularly check the engine oil level. If the engine oil contains excessive impurities, such as alloy powder or metal shavings, completely replace it with new oil. The brand and quality of the replacement oil must meet seasonal requirements. It is recommended to add Met-Rx Super Sealant & Lubricant to the engine oil. It is an excellent gearbox additive that forms an inert material film on components, which can reduce oil seal leakage, extend the service life of oil seals and gears, and reduce gearbox noise. The use of this Met-Rx super sealant lubricant will not contaminate or degrade the oil.

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