What Are The Selection Criteria When Purchasing Pressure-Resistant Oil Seals?

Number of hits：3682023-10-08 16:40:31　

　　When it comes to purchasing pressure oil seals, there are several key criteria to consider to ensure you select the right product for your needs. These criteria are essential for the efficient operation of the application in which the oil seal will be used, and to prevent leaks or other issues.

　　1. Fluid Pressure Range: The range of operating fluid system pressure is a crucial factor. This includes the frequency and severity of pressure peaks. Most conventional oil seals are designed only to withstand very low-pressure applications (about 8 psi or less).

　　2. Temperature Range: The temperature range of the mechanism in which the seal is installed must not exceed the temperature range of the seal elastomer. This includes both the operating temperature and the temperature when at rest.

　　3. Shaft Speed: The maximum allowable shaft speed is a function of several factors, including the shaft finish, runout, housing bore and shaft concentricity, type of fluid being sealed, and the type of oil seal material.

　　4. Shaft Hardness: Longer seal life can be expected with shafts having a Rockwell (RC) hardness of 30 or more. When exposed to abrasive contamination, the hardness should be increased to RC 60.

　　5. Shaft Surface Finish: Most effective sealing is obtained with optimum shaft surface finishes. The sealing efficiency is affected by the direction of the finish tool marks and the spiral lead.

　　6. Concentricity: When the bore and shaft centers are misaligned, seal life will be shortened because the wear will be concentrated on one side of the sealing lip.

　　7. Shaft and Bore Tolerances: The best seal performance is achieved when close shaft and bore tolerances are present. Other factors include shaft eccentricity, end play, and vibration.

　　8. Lubricant: Seals perform much better and longer when they are continuously lubricated with an oil that has the correct viscosity for the application and that is compatible with the seal lip elastomer material.

　　By considering these factors when selecting a pressure oil seal, you can ensure that you choose a product that will provide optimal performance in your specific application.