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2020

How to choose the right large size sealing accessories?

From the point of view of environmental protection, large-size seals must not allow the oil, fuel, harmful liquids and gases and other fluid media inside the machine and system to leak to the surrounding environment. For some petroleum, chemical and atomic energy industries, the leakage rate of large-scale seals should be controlled below 10-7cm3/s. These indicators have been recognized by many countries in the world. However, the sealing of fluid is a complex and difficult problem to solve, the reliability of the seal is not only related to the sealing material and sealing element, but also related to the structure of the connection, the characteristics of the fluid medium, the working conditions and many other factors.

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from the viewpoint of environmental protection,Large size sealNever allow the machine and the system inside the oil, fuel, harmful liquid and gas and other fluid medium leakage to the surrounding environment. for certain petroleum, chemical, and atomic energy industries,Large size sealThe leakage rate should be controlled below 10-7cm3/s. These indicators have been recognized by many countries in the world. However, the sealing of fluid is a complex and difficult problem to solve, the reliability of the seal is not only related to the sealing material and sealing element, but also related to the structure of the connection, the characteristics of the fluid medium, the working conditions and many other factors.

The seal is an important basic component to prevent oil leakage, air leakage, water leakage and the intrusion of external environmental media and dust. The correct selection, installation and use of seals are of great importance to prevent product leakage and environmental pollution caused by it, improve product appearance, improve product efficiency and performance, save energy and materials, prevent equipment failure, and ensure personal safety. Meaning.

SelectLarge size sealThe sealing ring must start from the characteristics of the product. In the daily selection of the sealing ring, in addition to the selection of the shape and size of the sealing ring, the characteristics of the sealing ring material must also be considered. The characteristics of the sealing ring of different materials are also different. For example: silicone sealing ring has excellent heat resistance, cold resistance, ozone resistance, atmospheric aging resistance, good insulation performance, but the tensile strength is poor and not oil resistance; and fluorine rubber sealing ring for most oil products and Solvents have resistance, especially acids, aliphatic hydrocarbons and animal and vegetable oils. Natural rubber sealing ring has good wear resistance, elasticity, tensile strength and elongation, but it is easy to age in the air, become sticky when exposed to heat, easy to expand and dissolve in mineral oil or gasoline, and is resistant to alkali but not Strong acid; and polyurethane sealing ring has very good mechanical properties, and its wear resistance and high pressure resistance are far better than other rubbers.

Therefore, only by understanding the characteristics of various sealing rings can we choose more suitable accessories according to the actual working conditions to meetLarge size sealdemand.

Key words:

Large size seal