With the continuous application of new chemical materials and the improvement of lining technology, fluorine-lined valves are favored by manufacturers and users for their safety, reliability and high cost performance. They are more and more widely used in strong corrosive process media in petroleum, chemical, pharmaceutical and other industries. However, fluorine-lined valves are not able to adapt to all corrosive working conditions. Like other valves, it is very important to choose and use fluorine-lined valves well.
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Especially for the fluorine-lined bellows sealing regulating valve (because the bellows are mostly made of polytetrafluoroethylene, the bellows will easily break when the pressure and pressure difference are too large), most of the manufacturer's selection samples indicate that the nominal pressure is PN≤2.5MPa , this is for insurance purposes.
Requirements for the medium of fluorine-lined valves: the medium used for fluorine-lined valves should not have hard particles, crystals, impurities, etc., so as to avoid the wear of the fluorine-lined plastic layer or bellows during the opening and closing of the valve. If the medium has hard particles, crystals, and impurities, corrosion-resistant precious metal materials can be selected according to the characteristics of the process medium, such as hard-sealed valves such as Hastelloy alloy, nickel-based alloy, and alloy steel.
The PTFE lining in fluorine lined butterfly valves provides exceptional resistance to a wide range of corrosive chemicals, acids, bases, and solvents. This makes them suitable for handling aggressive and corrosive media in industries such as chemical, pharmaceutical, and petrochemical.
The PTFE lining forms a tight and reliable seal, ensuring bubble-tight shut-off and preventing any leakage. This makes fluorine lined butterfly valves ideal for applications where leak-free operation is critical, such as in hazardous or environmentally sensitive areas.
The PTFE lining reduces friction between the disc and the valve body, allowing for smooth and easy operation of the valve. This results in lower torque requirements for actuation and ensures precise control of flow.
Fluorine lined butterfly valves can withstand a wide range of temperatures, from cryogenic to high-temperature applications. They also have excellent pressure resistance, making them suitable for both low-pressure and high-pressure systems.
The PTFE lining in fluorine lined butterfly valves has excellent non-stick properties, preventing the accumulation of solids or debris on the valve disc and ensuring smooth and uninterrupted flow.
Fluorine lined butterfly valves can be used in a wide range of industries and applications, including chemical processing, water treatment, power generation, food and beverage, and pharmaceutical. They are suitable for both on/off and throttling applications.
The PTFE lining is easy to clean and maintain, and the valve can be easily disassembled for inspection, repair, or replacement of the lining if necessary. This results in reduced downtime and maintenance costs.
What is a fluorine-lined valve?
A fluorine-lined valve is a type of valve that has a fluorine plastic (e.g., PTFE) lining to improve the corrosion resistance of the valve. The main components of a fluorine-lined valve include the valve body, valve stem, valve cover, and bushing. The bushing is a liner made of fluoroplastic that provides a surface inside the valve in contact with the fluid. Fluorine-lined valves are commonly used to handle corrosive liquids and gases such as acids, alkalis, and chlorine. With good corrosion resistance, wear resistance, high temperature resistance, and good sealing properties, fluorine lined valves are widely used in the chemical, petroleum, pharmaceutical, and food industries.
Fluorine-lined valves have the following characteristics:
1. Good corrosion resistance:
Fluorine lined valves are internally lined with fluorine plastic, which has good corrosion resistance and can handle various corrosive media.
2. Good sealing:
Fluorine lined valve adopts a bushing sealing structure, which performs well and effectively prevents medium leakage.
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3. Good abrasion resistance:
The fluorine lined valve is lined with fluorine plastic, which has good abrasion resistance and can adapt to the flow of high speed fluid.
4. Good high temperature resistance:
Fluorine plastic has good high temperature resistance, and fluorine lined valves can adapt to high temperature media processing.
5. Long service life:
The fluorine plastic lining inside the fluorine lined valve has good corrosion and wear resistance, which can prolong the valve’s service life.
6. Convenient maintenance:
The fluorine plastic lining inside the fluorine lined valve is easy to clean and maintain, which can reduce the maintenance cost and workload.
With the continuous application of new chemical materials and the improvement of lining technology, fluorine-lined valves are favored by manufacturers and users for their safety, reliability and high cost performance. They are increasingly widely used in strong corrosive process media in petroleum, chemical, pharmaceutical, and other industries. However, fluorine-lined valves are not able to adapt to all corrosive working conditions. Like other valves, it is very important to choose and use fluorine-lined valves well.
1. The temperature of the fluorine-lined valve should be about 30% lower than the upper limit
The temperature used for fluorine-lined valves: currently commonly used valve lining materials include synthetic rubber (-10-120°C), polytetrafluoroethylene PTEF (-200-180°C), soluble polytetrafluoroethylene PFA (-196-260°C) , FEP F46 (-85-150°C). The actual temperature of the medium used varies according to the material and pressure.
The long-term use temperature should usually be lower than the upper limit by about 30%, otherwise, the lining of each part of the valve is easily deformed, resulting in large leakage or failure of the valve to switch normally.
2. Fluorine-lined valves are not suitable for high pressure and high pressure difference occasions
Especially for the fluorine-lined bellows sealing regulating valve (because the bellows are mostly made of polytetrafluoroethylene, the bellows will easily break when the pressure and pressure difference are too large), most of the manufacturer’s selection samples indicate that the nominal pressure is PN≤2.5MPa , this is for insurance purposes.
3. The medium should not have hard particles, crystals, impurities, etc
Requirements for the medium of fluorine-lined valves: the medium used for fluorine-lined valves should not have hard particles, crystals, impurities, etc., so as to avoid the wear of the fluorine-lined plastic layer or bellows during the opening and closing of the valve.
If the medium has hard particles, crystals, and impurities, corrosion-resistant precious metal materials can be selected according to the characteristics of the process medium, such as hard-sealed valves such as Hastelloy alloy, nickel-based alloy, and alloy steel.
4. The diameter of the fluorine-lined (plastic) valve should be 30~85%
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