German Transfluid seals Transfluid models Transfluid prices

Transfluid 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 within 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. Based on 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. Based on skeleton type, they can be classified as internally covered skeleton oil seals, externally exposed skeleton oil seals, and assembled oil seals. Based on 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.

Transfluid seal types

1) Compression seals: Compression seals, especially O rings, have been widely used in sealing applications. Other types such as X type, T type, D type, square, triangular, etc., are suitable for different applications. Improvements aim to make sealing performance stable and reliable, increase 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 to increase pressure resistance and reduce friction. Some manufacturers' products are rated for speeds up to 7.5m/s and sealing pressures of 5.6MPa. 2) Reciprocating lip seals: Reciprocating lip seals, also known as lip packings or cup seals, are widely used for dynamic sealing in hydraulic system reciprocating cylinders. The pressure-bearing surface is lip-shaped; during installation, there is a minimal interference fit, allowing the lip edge to fully contact the sealing surface to create a seal. When the cylinder operates, as pressure increases, contact force and contact area increase, thereby improving sealing. During the cylinder return stroke, pressure decreases, and contact area and friction are lower than during the working stroke, creating a breathing effect that lubricates the lip. There are many types of reciprocating seals; common ones include J type, L type, U type, V type, and Y type. There are also various combination and composite seals, such as U-shaped, V-shaped, 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 in the middle of the sealing area can store media, improving lubrication, reducing lip wear, and ensuring 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, bonded PTFE AF type, dual-modulus return flow type, etc. The advantage of externally exposed assembled types is accurate positioning, high concentricity, and good heat dissipation conditions. They are stable under pressure and vibration, resulting in longer service life and 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 area, a return flow effect is achieved, while reducing product design and mold processing costs. Joints between rigid waterproof layers and gable walls, parapet walls, and protruding roof structures should be properly treated with flexible sealing.

Transfluid 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 substandard, the component itself is not a good product. Many factors affect seals. First, pressure is a significant factor affecting 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 define 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, media, temperature, seal material, seal type, and motion speed all influence seals. Finally, surface treatment. Experience shows that the surface characteristics of cylinder pistons and piston rods significantly affect seal life. Surface characteristics are commonly defined by the RA value, where RA is the arithmetic mean of the absolute deviations of the surface profile 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 profile characteristics can cause varying degrees of seal wear.

Transfluid seal precautions

1) Obtain a fixed quantity of oil seals. 2) From receipt to assembly, oil seals must be kept clean. 3) Before assembly, inspect the oil seals. Measure all dimensions of the skeleton oil seal to ensure they match the shaft and housing dimensions. Before installing the skeleton oil seal, clearly compare the shaft diameter with the oil seal's inner diameter; they must match. The housing internal dimensions must suit the oil seal's outer diameter width. Check if the skeleton oil seal lip is damaged or deformed, and if the spring has fallen off or rusted. Prevent the oil seal from being stored flat during transport, subjected to external squeezing and impact, which could destroy its roundness. 4) Before assembly, perform machining inspections. Measure whether all dimensions of the housing and shaft are correct, especially the internal chamfer, which must not have a slope. The shaft and housing end faces must be machined smoothly; chamfers must be free of damage and burrs. Clean the assembly area. The shaft insertion area (chamfer) must be free of burrs, sand, iron chips, and other debris, which can cause irregular damage to the oil seal lip. It is recommended to use an r angle for the chamfer. 5) Regarding operation technique, use your hand to feel if the surface is smooth and truly round. 6) Do not tear open the packaging paper of the skeleton oil seal too early before installation to prevent debris from adhering to the seal surface and entering the work environment. 7) Before installation, apply an appropriate amount of lithium-based grease containing molybdenum disulfide between the lips of the skeleton oil seal to prevent dry grinding of the lip during instantaneous shaft startup, which affects the lip interference fit. Assemble as soon as possible. If the oil seal housing with the installed seal is not immediately mounted, cover it with a cloth to prevent foreign matter from adhering to the seal. Hands or tools applying lithium grease must be clean. 8) Skeleton oil seals must be installed flat, without tilting. It is recommended to use hydraulic equipment or sleeve tools for installation. Pressure should not be excessive; speed should be uniform and slow. 9) Mark the machine where the skeleton oil seal is installed for tracking purposes, and carefully monitor the entire process.

Weidou Intelligent Technology professionally sells German Transfluid seals, Transfluid O-rings, Transfluid sealing strips, Transfluid pipe seals, Transfluid cable seals, Transfluid rubber seals, Transfluid mechanical seals, Transfluid gaskets, Transfluid oil seals, Transfluid shaft seals, Transfluid metal seals, Transfluid high-pressure seals, Transfluid spiral seals, Transfluid centrifugal seals, Transfluid sealing rings, Transfluid original German imports. Welcome inquiries and orders from users.