excavator dredge pump supplier

Requirements of the shaft
Even more important than a correct interference fit of the Oil Seal is a perfectly smooth shaft in the region of the seal, particularly if shaft surface speed is high and the medium to be sealed is under a certain amount of excess pressure. The surface roughness of the shaft depends on the average profile depth Ra of the tool marks caused by the machining process. Oil Seals made of PTFE require, independent of the surface speed, a surface roughness of between 0,1 to 0,2 mm, because PTFE has less wear resistance than rubber seals. For normal circumstances, the shaft in the region of the seal must have a surface roughness of approximately:  To summarize, the surface of the shaft in the region of the seal should not have noticeable machining marks. For pivoting shafts and other difficult or critical sealing applications, it is recommended that Oil Seals with a helical groove hydrodynamic pattern, which has a pumping effect, be used. When grinding and polishing, an axial movement of the grindstone along the shaft must be avoided in order to prevent machine lay. 

Oil seals play a vital role in the efficient operation of machinery and equipment by preventing the leakage of oil or other fluids. One commonly used type of oil seal is the 65x90x10 oil seal, which is designed to fit a specific shaft size of 65mm, an outer diameter of 90mm, and a thickness of 10mm. These seals are typically made from rubber or other flexible materials that can withstand the harsh conditions often found in machinery.

We just discovered that one of the seals on our pumping system is leaking. Do you have any ideas as to what could have caused this, and can you offer some advice for selecting a good seal?

Metal O.D. wall
(with a reinforcing inner metal case)

Table 8: Housing design checklist

The primary function of a shaft oil seal is to retain lubricating fluids within the system while preventing the ingress of external contaminants. This is particularly important in high-speed applications where the loss of lubricant or the entry of contaminants could lead to rapid wear and damage to the equipment.

The 40mm rubber gasket is a versatile sealing solution that is commonly used in plumbing systems, automotive engines, hydraulic systems, and other machinery where a tight seal is required. Made from high-quality rubber materials, these gaskets are designed to withstand high temperatures, pressure, and chemicals, making them suitable for a wide range of applications.

Oil seals are made from multiple compounds and materials. Some of the oldest, still in use today, are leather and felt compounds. The trend in mass production, however, has seen a move towards synthetic rubber or elastomers. Nitrile is by far the most popular material but developments in PTFE have created a surge of interest in buyers needing seals for high-speed shaft rotation applications. Viton is taking over from the polyacrylic and silicone, as it works better in high-temperature applications and has a high-resistance to abrasion and harmful chemicals.