German prominent seals prominent models prominent prices

prominent seals utilize the "container" concept from transportation to create cartridge seals. The rotating and stationary parts of this seal are pre-assembled into a single unit before installation. After passing inspection and pressure testing, the unit is mounted on the shaft within the stuffing box, fixed to the shaft with set screws, and the gland bolts are tightened. Once the cartridge positioning tabs are removed, the mechanical seal operates in a parallel face condition and is ready for service. This approach not only simplifies assembly but also ensures assembly quality. Welded metal bellows mechanical seals are all designed as cartridge seals, offering the aforementioned advantages. Cassette seals are also a type of cartridge mechanical seal. In this seal, the stationary ring, rotating ring, sleeve, gland, and auxiliary seals are all assembled together on a sleeve before installation, facilitating inspection of assembly quality. After passing inspection, simply tighten the seal cover and secure the screws. This pre-assembled, inspected, and tested seal component makes it easy to ensure installation and assembly quality.

prominent seal classification

Oil seals are generally divided into single-piece 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 and names. However, conventionally, rotary shaft lip seals are referred to as oil seals, while static seals and dynamic seals (generally reciprocating motion) 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 garter spring. The term oil seal commonly refers to this type of tc caged oil seal.

prominent seal materials

Common materials for oil seals include: Nitrile rubber, Fluoroelastomer, Silicone rubber, Acrylate rubber, Polyurethane, Polytetrafluoroethylene, etc. 1) Nitrile rubber (NBR): It offers good heat and wear resistance, and resistance 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) Acrylate 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. Suitable for operation in the -30 to 150 degrees Celsius range. 3) Fluoroelastomer: Resistant to aging, heat, and oil. 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. Suitable for temperatures from -20 to 250 degrees Celsius. 4) Silicone rubber: 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: 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 fluoroelastomer are widely used oil seal materials. The former is low-cost, while the latter offers significantly improved temperature resistance and sealing performance but is more expensive. 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, one must consider the material's compatibility with the working medium, adaptability to the operating temperature range, and the lip's ability to follow the rotating shaft at high speeds. Generally, the lip temperature of an oil seal during operation is 20 to 50℃ higher than the working medium temperature, which should be noted when selecting materials. The operating range of an oil seal depends on the material used: Nitrile rubber (NBR) is -40 to 120℃, Acrylate rubber (ACM) is -30 to 180℃, and Fluoroelastomer (FPM) is -25 to 300℃.

prominent seal precautions

1) Before designing grooves, please carefully read the product descriptions for each series to determine whether the product uses a one-piece groove or a split groove. During seal installation, avoid sharp edges. Installing bore seals into a one-piece groove requires installation tools. Designers must consider parameters such as groove dimensional accuracy, surface roughness, and extrusion gap. Please refer to the product instructions, diagrams, and dimension tables for details. 2) Before installing the seal, ensure there are no impurities or cracks in the seal groove. Apply assembly oil to both the seal groove and the seal surface. Install the seals gradually in sequence. Avoid sharp edges during installation, align the seal properly, and prevent twisting or tilting. If using a split groove, tighten the gland last.

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