German dutec seals dutec models dutec prices

dutec seals are materials or components that prevent leakage of fluids or solid particles from adjacent mating surfaces and prevent external contaminants such as dust and moisture from entering machinery. The recommended storage temperature for seals is below 30°C to avoid high-temperature aging. Seals are classified into static seals and dynamic seals. Their main function is to prevent leakage of fluids or solid particles from adjacent mating surfaces and to prevent external contaminants such as dust and moisture from entering machinery. Static sealing refers to the tight closure of sealed chambers or containers used for sealing letters and testamentary seals.

dutec seal classification

Oil seals are generally divided into monolithic and assembled types. Assembled types allow free combination of the cage and lip material, typically used for special oil seals. Based on sealing function, characteristics, structural type, operating condition, and sealing mechanism, oil seals can be categorized into various forms with different names. However, conventionally, rotating shaft lip seals are referred to as oil seals, while seals for static and dynamic (generally reciprocating) applications are called seals. 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 caged oil seal.

dutec seal materials

Common materials for oil seals include: Nitrile rubber, Fluorocarbon rubber, Silicone rubber, Acrylate rubber, Polyurethane, Polytetrafluoroethylene, etc. 1) Nitrile rubber (NBR): It has good heat and wear resistance, and is resistant to various lubricating oils, greases, and oil-gas mixtures. The applicable temperature range is -30 to 120 degrees Celsius. However, it cannot be used in phosphate ester hydraulic fluids 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, and UV radiation resistance. It is especially resistant to lubricating oils, gear oils, motor oils, engine oils, and petroleum-based hydraulic fluids containing extreme pressure agents. It is suitable for operation in the range of -30 to 150 degrees Celsius. 3) Fluorocarbon rubber: Resistant to aging, heat, and oil. It is suitable for almost all lubricating oils, fuel oils, and gasoline. It does not harden easily in oils containing extreme pressure additives. However, it has poor cold resistance and high-temperature wear resistance, and significant permanent compression set. It is suitable for temperatures from -20 to 250 degrees Celsius. 4) Silicone rubber: Has outstanding high and low-temperature resistance. It can be used long-term at 150 degrees Celsius without performance change; it can be used continuously at 200 for 10000h. It maintains its unique elasticity, ozone resistance, and weather resistance in the working temperature range of -70 to 260. 5) Polytetrafluoroethylene: Has outstanding chemical stability, thermal stability, low friction, and self-lubrication. Its decomposition temperature is above 400. Therefore, it can operate normally in the temperature range of -200 to 300 degrees Celsius. Except for free fluorine and alkali metals, it has excellent corrosion resistance to chemicals, solvents, hydroxides, and acids. Nitrile rubber and fluorocarbon rubber are widely used oil seal materials. The former is low-cost, but the latter offers significant improvements in temperature resistance and sealing, though at a higher cost. It still retains some common disadvantages of ordinary rubber materials, such as poor wear resistance, short service life, and high sensitivity to shaft eccentricity, making leakage relatively common. PTFE oil seals are high-tech products and represent the future direction of oil seal development [2]. When selecting oil seal materials, compatibility with the working medium, adaptability to the working temperature range, and the lip's ability to follow the rotating shaft at high speeds must be considered. Generally, the lip temperature of an oil seal is 20 to 50°C higher than the working medium temperature, which should be noted during material selection. The operating range of an oil seal depends on the material: Nitrile rubber (NBR) is -40 to 120°C, Acrylate rubber (ACM) is -30 to 180°C, and Fluorocarbon rubber (FPM) is -25 to 300°C.

dutec seal specifications and applications

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

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