451650 seals Germany schnorr model 451650 price

451650 seals are sealing devices installed to prevent leakage between the pump shaft and the housing. Common shaft seal types include packing seals, mechanical seals, and power seals. The shaft seal of a reciprocating pump is usually a packing seal. When transporting media where leakage is not permitted, a diaphragm reciprocating pump can be used. The shaft seals of rotary pumps (including vane pumps, rotor pumps, etc.) mainly include packing seals, mechanical seals, and power seals. The shaft seal of a reciprocating pump is usually a packing seal. When transporting media where leakage is not permitted, a diaphragm reciprocating pump can be used. The shaft seals of rotary pumps (including vane pumps, rotor pumps, etc.) mainly include packing seals, mechanical seals, and power seals.

451650 seal classification

Oil seals are generally divided into single-piece types and assembled types. The assembled type allows free combination of the cage and lip material, and is generally used for special oil seals. Oil seals can be divided into various forms and names based on their sealing function, characteristics, structural type, operating state, and sealing mechanism. However, conventionally, rotating shaft lip seals are called oil seals, while seals for static sealing and dynamic sealing (generally reciprocating motion) are called seals. The representative form of an oil seal is the TC oil seal, which is a double-lip oil seal with a self-tightening spring fully covered by rubber. The term oil seal commonly refers to this type of tc caged oil seal.

451650 seal material

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 super-long term at 150 degrees Celsius without performance change; it can be used continuously at 200 for 10000h; and it maintains its unique elasticity, ozone resistance, and weather resistance within the working temperature range of -70 to 260. 5) Polytetrafluoroethylene: It has outstanding chemical stability, thermal stability, friction reduction, and self-lubrication. Its decomposition temperature is above 400. Therefore, it can work 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 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, 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 oil seal materials. The operating range of an oil seal depends on the material used: for Nitrile rubber (NBR), it is -40 to 120℃; for Acrylic rubber (ACM), it is -30 to 180℃; for Fluorocarbon rubber (FPM), it is -25 to 300℃.

451650 seal specifications and applications

1) Standard single-lip type: Generally used for sealing mineral oil, water, and other media in high and low-speed rotating shafts and reciprocating motions. Standard oil seals are used in environments with little dust and impurities, resisting medium pressure<0.05MPa conditions, maximum linear speed 15m/s, reciprocating motion 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 and resist medium pressure<0.05MPa conditions, linear speed ≤15m/s. 3) Springless type: Single-lip internal-cage 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-cage single-lip type: 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, resisting medium pressure<0.05MPa conditions. For cases where the rotating shaft linear speed is ≤15m/s. 5) External-cage double-lip type: 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 and resist medium pressure<0.05MPa conditions. Rotational speed ≤15m/s. 6) Assembled single-lip type: 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. Medium 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's 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 medium pressure<0.05MPa conditions, rotational speed ≤20m/s. 8) Pressure-resistant type: Short lip and short, thick waist, providing pressure resistance. Working pressure ≤3MPa. Suitable for conditions where medium pressure ≤3MPa. Applicable 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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