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As can be seen from the seal cross-section shown in Fig. 14.2, shaft seals are complex shapes that require advanced mold design and molding techniques (see Section 7.3 for discussion of fluoroelastomer molding). For some time, most shaft seals were made in the United States by compression molding. Injection molding of shaft seals is prevalent in Europe, and is being used increasingly in the United States. An advantage of compression molding is that preforms (usually rings cut from extruded tubing) are used that closely approximate the amount of stock required for the final parts, so compound waste is minimized. For injection molding, the amount of cured stock in the central sprue and runner (actually a thin sheet leading to the seal lip) is often large compared to the stock required for the final part, so the waste of high-cost fluoroelastomer may be high. Such waste is reduced in modern injection molding designs.
These are comparable to type R and RST, except the outer case does not have a metal reinforcement ring. To compensate, the outside is not made of normal rubber, but a hard, heavy-duty rubber fabric. The advantage is that these types can be made in a split version. They are almost always produced to order, and made of NBR or FKM.



u shaped rubber gasket. The U shape of the gasket creates a compression seal when it is installed, ensuring that no air or liquid can escape from the sealed area. This tight seal helps to prevent leaks, reduce energy loss, and protect sensitive equipment from environmental contaminants.
Indeed, when installing this oil seal, the oil sump must be installed using silicone seal. Removal of the old seal and oil sump is necessary, otherwise the oil seal cannot be fitted properly either. If these steps are not followed, leakage is inevitable.
When installing a product, people often ignore the instructions because there is an idea that we can do it ourselves. However, oil seals are fragile devices that require attention and specific instructions to be followed before and after use.
Mechanical seals, like oil seals, can be easily damaged during installation. Taking the time to read the installation manual will provide you with step-by-step information on the correct installation or replacement of oil seals.