What are the types of sealing rings currently in use?
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Depending on the manufacturing method and materials used, the sealing rings in use today come in various structures, including integral sealing rings (made from the same material), modular sealing rings, those with hard alloys surfacing welded on, and those coated with ceramics. What are the types of integral sealing rings? These sealing rings are made from the same material, so the properties of this material are uniform throughout the ring; as a result, there are no defects such as leakage or separation that occur with modular sealing rings, nor is there any risk of electrochemical corrosion. Graphite is commonly used to manufacture soft rings, while various alloy steels can be used for hard rings, such as bearing steel (GCr9), high-speed steel (W18Cr4V), and other alloy steels (such as 40Cr, 3Cr13, etc.). Alloy cast irons (such as those containing silicon, chromium, and nickel) are also used in some cases. When using these materials, appropriate heat treatment processes must be applied to enhance their hardness and wear resistance. These materials are inexpensive, and if used properly, they also have a long lifespan. To further improve hardness and extend service life, it can be manufactured using cemented carbide. The commonly used cemented carbide is cobalt-based tungsten carbide, which has good performance but is expensive. Steel-bonded cemented carbide has a lower price. To improve corrosion resistance in corrosive media, there is nickel-based tungsten carbide; Hastelloy offers even higher corrosion resistance, but at a higher cost. In addition, there are also sealing rings made of silicon carbide and other ceramic materials.
The integral sealing rings currently in use can be divided into the following main types, depending on their manufacturing materials and processes: 1. Graphite sealing rings: Graphite possesses good self-lubricating properties and heat resistance; therefore, it is widely used in high-temperature environments or situations where self-lubrication is required. 2. Alloy steel sealing rings: Various alloy steels (such as bearing steel GCr9, high-speed steel W18Cr4V, 40Cr, 3Cr13, etc.) can be used to manufacture sealing rings. These materials can have their hardness and wear resistance improved through appropriate heat treatment, thereby extending their service life. 3. Alloy cast iron sealing rings: Alloy cast iron materials such as silicon-chromium-nickel cast iron can also be used to manufacture sealing rings, offering good corrosion resistance and wear resistance. 4. Cemented carbide sealing rings: Cobalt-based tungsten carbide is a commonly used cemented carbide material, offering excellent wear resistance and impact resistance, but at a higher cost. Steel-bonded cemented carbide has a relatively low price. 5. Nickel-based tungsten carbide sealing rings: They possess good corrosion resistance and are suitable for use in corrosive environments. 6. Hastelloy sealing rings: Hastelloy possesses high corrosion resistance, but is expensive and suitable for extreme corrosive environments. 7. Ceramic material sealing rings: Ceramics such as silicon carbide possess extremely high hardness, corrosion resistance, and wear resistance, making them suitable for use in harsh conditions. The material selection and design of the sealing ring depend on the specific requirements of the application, such as the temperature and pressure of the operating environment, the type of medium, the relative speed of movement, and the required sealing performance. The proper selection and use of sealing rings play a crucial role in ensuring the proper operation and service life of mechanical equipment. .