Valve sealing type The most important component of the entire valve type, its main purpose is to prevent leakage. The valve sealing seat is also called a sealing ring. It is an organization that directly contacts the medium in the pipeline and prevents the medium from circulating. When the valve is in use, there are various media in the pipeline, such as liquid, gas, oil, corrosive media, etc., and different valve seals are used in different places and can adapt to various media.
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The following is a description of commonly used sealing materials for valves:
Nitrile rubber (NBR-HNBR)
Nitrile rubber is a butadiene-based polymer, usually with aliphatic hydrocarbons (propane, butane, oil, mineral oil, petroleum, petroleum gas and kerosene), air, water, soft acid, alcohol Use with turpentine, but not recommended for use with flavors, polar solvents and strong acids. Nitrile rubber shows good mechanical properties and strong wear resistance, but it is not resistant to oxygen, ozone and light. The working temperature of nitrile rubber is -20°C to 100°C.
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Fluorine rubber (FPM)
Fluorine rubber has the characteristics of high temperature resistance, oxygen resistance, ozone resistance and light resistance, and can be used with mineral oil, fuel, hydraulic fluid, organic solution and vacuum, but it can not be used with halogenated hydrocarbons and Freon, and is not recommended At low temperature. The operating temperature of fluoroelastomer is -10°C to 200°C.
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Neoprene (CR)
Neoprene is suitable for use with alcohol, soft acid, air, water, acetone, and neutral gas. It has good oil resistance and can be used in refrigeration systems that use high aniline point lubricants. Neoprene has good ozone resistance and aging resistance, and has good mechanical properties over the entire operating temperature range. The operating temperature of neoprene is -30°C to 100°C.
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EPDM
EPDM rubber is derived from the copolymerization of ethylene and propylene and is recommended for use with phosphate-based hydraulic fluids, ethylene glycol-based brake fluids, hot water, and steam above 150°C. It can also be used with polar solvents and has the characteristics of resistance to oxygen, ozone and light. The working temperature of EPDM rubber is -40°C to 130°C.
Perfluoroelastomer (FFKM-FFPM)
Perfluoroelastomer has the same chemical properties as polytetrafluoroethylene (PTFE), and has the same elastic properties as fluororubber (FPM), and is compatible with almost all chemicals, especially recommended for use with corrosive liquids It has the characteristics of resistance to oxygen, ozone and aging. It is also suitable for high-temperature vacuum environments, but it is not recommended for use with fluorinated combined liquids such as Freon. The operating temperature of perfluoroelastomer is -20°C to 250°C.
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Polytetrafluoroethylene (PTEE)
Teflon has excellent chemical properties, but it is not suitable for melting alkaline metals, nor for fluorinated conjugates under high temperature and pressure, nor for some halogen units. There is no problem with the absorption of fluids (such as water) by PTFE. The working temperature of PTFE is -150°C to 180°C.
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Polychlorotrifluoroethylene (PCTFE)
Polychlorotrifluoroethylene is suitable for most corrosive chemicals, such as organic solutions, hot water, water vapor, chlorate gas, and low-temperature liquids, but it is not recommended for use with some halogen products. It has light and radiation resistance. characteristic. The working temperature of polychlorotrifluoroethylene is -50°C to 180°C.
Silicone rubber (Q-MQ-MVQ)
Silicone rubber includes a variety of rubber materials and is composed of methyl acetate and vinyl rubber. It is suitable for engine, transmission oil, animal or vegetable fat, but it is not recommended for water vapor, silicone fat, fuel and aromatic hydrocarbons. Used together, it has the characteristics of weather resistance, ozone resistance and aging resistance, and is physiologically neutral. It has good high temperature resistance and low temperature resistance characteristics. The operating temperature of silicone rubber is -50°C to 190°C.
