Germany optek-Danulat seals optek-Danulat model optek-Danulat price

optek-Danulat seals are a type of friction seal or stuffing box used to prevent liquid leakage between the shaft and bearing of compressors or other fluid handling equipment. They are also sealing devices installed to prevent leakage at the pump shaft and housing. Common shaft seal types include packing seals, mechanical seals, and hydrodynamic seals. The shaft seal of a reciprocating pump is typically a packing seal. When transporting media where leakage is not permitted, diaphragm reciprocating pumps can be used. The shaft seals of rotary pumps (including vane pumps, rotor pumps, etc.) mainly consist of packing seals, mechanical seals, and hydrodynamic seals.

optek-Danulat Seal Classification

Oil seals are generally divided into single-piece and assembled types. Assembled types allow free combination of the cage and lip material and are generally used for special oil seals. Based on sealing function, characteristics, structural type, operating state, 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 static seals and dynamic seals (generally for reciprocating motion) are called sealing elements. The representative form of an oil seal is the TC oil seal, which is a double-lip oil seal fully encapsulated in rubber with a self-tightening spring. The term 'oil seal' commonly refers to this type of tc caged oil seal.

optek-Danulat 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 mineral oils with low aniline points. 2) Polyacrylate rubber (ACM): It has 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: It offers aging, heat, and oil resistance and is suitable for almost all lubricating oils, fuel oils, and gasoline. It does not harden easily in oils containing extreme pressure additives. However, its cold resistance and high-temperature wear resistance are poor, and it has significant permanent compression set. It is suitable for temperatures from -20 to 250 degrees Celsius. 4) Silicone rubber: It 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: It has outstanding chemical stability, thermal stability, low friction, and self-lubricating properties. 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 performance, 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, 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, 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℃, Acrylic rubber (ACM) is -30 to 180℃, and Fluorocarbon rubber (FPM) is -25 to 300℃.

optek-Danulat 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 seal. Measure all parts of the caged oil seal to ensure dimensions match the shaft and housing. Before installing the caged oil seal, clearly compare the shaft diameter with the oil seal's inner diameter to ensure they match. The housing dimensions must suit the oil seal's outer diameter width. Check if the lip of the caged oil seal 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 or impact, which could destroy its roundness. 4) Perform machining inspection procedures before assembly. Measure whether the dimensions of the housing and shaft parts are correct, especially the internal chamfer, which must not have a slope. The end faces of the shaft and housing must be machined smoothly. Chamfers must be free of damage and burrs. Clean the assembly area. There must be no burrs, sand, iron chips, or other debris at the shaft insertion point (chamfer), as these can cause irregular damage to the oil seal lip. It is recommended to use an r angle for the chamfer. 5) Regarding operational technique, use your hand to feel if the surface is smooth and truly round. 6) Do not tear open the packaging paper of the caged oil seal too early before installation to prevent debris from adhering to the seal surface and entering the working environment. 7) Before machine installation, apply an appropriate amount of lithium-based grease with molybdenum disulfide between the lips of the caged oil seal. This prevents dry grinding of the lip during instantaneous shaft startup, which affects the lip's 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) Caged 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, and speed should be uniform and slow. 9) Mark the machine on which the caged oil seal is installed for tracking purposes. Pay close attention to the entire process.

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