German Westaflex seals Westaflex models Westaflex prices

Westaflex seals are typical representatives of oil seals; generally, the term "oil seal" 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 a dust-proof function, 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 for gasoline engine crankshafts, diesel engine crankshafts, gearboxes, differentials, shock absorbers, engines, axles, and other parts.

Westaflex seal classification

Oil seals are generally divided into monolithic types and assembled types; assembled types allow free combination of the skeleton and lip material, generally used for special oil seals. Based on sealing function, characteristics, structural type, operating state, and sealing mechanism, oil seals can be classified into various forms with different names, but conventionally, rotating shaft lip seals are called oil seals, while static seals and dynamic seals (generally reciprocating motion) are called sealing elements. The representative form of an oil seal is the TC oil seal, which is a rubber-covered double-lip oil seal with a self-tightening spring; the term "oil seal" commonly refers to this type of tc skeleton oil seal.

Westaflex seal materials

Common materials for oil seals include: nitrile rubber, fluororubber, silicone rubber, acrylic rubber, polyurethane, polytetrafluoroethylene, etc. 1) Nitrile rubber (NBR): It has good heat resistance and wear resistance, resists various lubricating oils, greases, oil-gas mixtures, etc., applicable temperature range -30~120 degrees Celsius, but cannot be used in phosphate ester hydraulic oils or gear oils containing extreme pressure additives; it performs stably in gasoline and low-aniline-point mineral oils. 2) Polyacrylate rubber (ACM): Superior oil and heat resistance, wear resistance, ozone resistance, UV radiation resistance, especially resistant to lubricating oils, gear oils, motor oils, engine oils, petroleum-based hydraulic oils containing extreme pressure agents, suitable for working in the range of -30~150 degrees Celsius. 3) Fluororubber: Resistant to aging, heat, and oil, suitable for almost all lubricating oils, fuel oils, and gasoline; does not harden easily in oils containing extreme pressure additives, but has poor cold resistance and high-temperature wear resistance, and significant permanent compression deformation, suitable for temperatures -20~250 degrees Celsius. 4) Silicone rubber: Has outstanding high and low-temperature resistance, can be used long-term at 150 degrees Celsius without performance change; can be used continuously at 200 for 10000h, maintaining its unique elasticity, ozone resistance, and weather resistance in the working temperature range of -70~260. 5) Polytetrafluoroethylene: Has outstanding chemical stability, thermal stability, friction reduction, and self-lubrication, with a decomposition temperature above 400. Therefore, it can work normally in the temperature range of -200~300 degrees Celsius. Except for free fluorine and alkali metals, it has excellent corrosion resistance to chemicals, solvents, hydroxides, and acids. Nitrile rubber and fluororubber are widely used oil seal materials; the former is low-cost, while the latter offers significantly improved temperature resistance and sealing, but is higher in cost and still retains some negative commonalities of ordinary rubber materials, such as poor wear resistance, short service life, and high sensitivity to shaft eccentricity, so leakage phenomena remain relatively common. PTFE oil seals are high-tech products and represent the future direction of oil seal development [2]. When selecting oil seal materials, one must consider the material's compatibility with the working medium, adaptability to the working temperature range, and the lip's ability to follow the rotating shaft at high speeds. Generally, during operation, the lip temperature is 20~50℃ higher than the working medium temperature, which should be noted when selecting materials. The working range of an oil seal depends on the material used: for nitrile rubber (NBR), it is -40~120℃; for acrylic rubber (ACM), -30~180℃; for fluororubber (FPM), -25~300℃.

Westaflex seal specifications and applications

1) Standard single-lip type: Generally used for sealing mineral oil, water, and other media in high/low-speed rotating shafts and reciprocating motions. Standard oil seals are used in environments with less dust and impurities, resisting medium pressure<0.05MPa occasions, maximum linear speed 15m/s, reciprocating speed<0.1m/s. 2) Standard double-lip type: In addition to the usage characteristics of the aforementioned S type oil seals, it also provides dust protection. Standard oil seals with a dust lip can prevent dust ingress, resisting medium pressure<0.05MPa occasions, linear speed ≤15m/s. 3) Springless type: Single-lip internally covered skeleton rubber oil seal without a spring. Generally suitable for low-speed conditions where the sealing medium is lubricating grease. Linear speed ≤6m/s. 4) External skeleton single-lip type: Single-lip externally exposed skeleton rubber oil seal with a spring; thin waist, good followability, good rigidity. Standard oil seals are used in environments with less dust and impurities, resisting medium pressure<0.05MPa occasions. For rotating shaft linear speeds ≤15m/s. 5) External skeleton double-lip type: Double-lip externally exposed skeleton rubber oil seal with a secondary lip; thin waist, good followability, high rigidity, good concentricity. Standard oil seals with a dust lip can prevent dust ingress, resisting medium pressure<0.05MPa occasions. Rotational speed ≤15m/s. 6) Assembled single-lip type: External skeleton oil seal formed by assembling inner and outer skeletons with rolled edges; features high installation precision, fast heat dissipation, and heavy-load characteristics. Suitable for heavy-load conditions under high temperature and high speed, medium pressure ≤0.05MPa, maximum linear speed ≤15m/s. 7) Unidirectional return type (right-hand/left-hand rotation): Angled ribs are manufactured on the air side of the lip, utilizing fluid dynamics principles to generate a unidirectional pumping action with a return effect. Related to the shaft's rotation direction, the radial force is smaller than that of standard oil seals due to the return effect, reducing wear and heat generation, extending service life, suitable for medium pressure<0.05MPa occasions, rotational speed ≤20m/s. 8) Pressure-resistant type: Short lip, short and thick waist, provides pressure resistance, working pressure ≤3MPa. Suitable for occasions with medium pressure ≤3MPa, suitable for shaft end oil seals of high-pressure pumps; generally, the PV value ≤8. Rotating shaft linear speed ≤15m/s.

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