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Description of the life cycle of the seal
Comparison of the life cycle costs of seal systems
The investment cost of lip rubber seals is similar. The high cost of lip seals is due to their complex construction and additional attachment to the radial movement of the shaft.
There are a variety of sealing options to choose from when sealing the rotating shaft. The most commonly used are lip seals and sliding seals. These seals have different structural types in actual use. For example, one seal can be used alone or in multiple sets. It can be used as one part or as a component; it can be used for dry friction. It can also be used under lubricated conditions and can be used with or without cleaning.
Sliding seals, whether dry-running sliding seals or wet lubricated sliding seals, offer cost savings over lip seals. In addition, years of practice have proven that sliding seals are qualified and reliable shaft seals in mixers and other process equipment such as dryers.
The basic restrictions for the use of different sealing systems are given in the attached table. In general, all seal systems can be used in simple applications where the pressure is low, the operating temperature is not high, and the sliding speed is not too fast. Lip seals are not available under vacuum conditions. Sliding seals are typically used under such conditions, either dry friction sliding seals or wet friction, i.e., lubricated sliding seals. If the requirements for the pressure limit and the sliding speed are increased, only wet-running rubber seals, ie lubricated seals, can be used.
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