Ball valves, as a common fluid control equipment, play an important role in the industrial field. In the classification of ball valves, fluorine lined ball valves and ordinary ball valves are two common and significantly different types. This article will explore the differences between them to help readers better understand when to choose fluorine lined ball valves or ordinary ball valves.
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1. Material selection
Ordinary ball valve: Usually made of metal, such as stainless steel, copper alloy, or cast iron. These materials have sufficient strength and corrosion resistance in many industrial applications.
Fluorine lined ball valve: It has an internal fluorine lining layer and usually uses fluoroplastics (such as polytetrafluoroethylene) as the inner layer material. This design makes it perform better in corrosive media.
2. Corrosion resistance performance
Ordinary ball valve: For some highly corrosive media, ordinary ball valves may require additional anti-corrosion coatings or special alloy materials.
Fluorine lined ball valve: It has excellent corrosion resistance and is lined with a fluoroplastic layer, which can effectively resist corrosive media such as strong acids and alkalis.
3. Temperature Applicable Range
Ordinary ball valve: In some high-temperature environments, there may be performance degradation, and it is necessary to choose appropriate materials to meet the high-temperature requirements.
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Fluorine lined ball valve: Cannot be used in places with excessively high temperatures, usually not exceeding 150 ℃.
4. Sealing performance
Ordinary ball valve: Due to the contact between metals, the sealing performance may be relatively low, requiring reliance on sealing rings or fillers.
Fluorine lined ball valve: The combination of spherical and fluorine lined materials provides excellent sealing performance and reduces the risk of leakage.
5. Application field
Ordinary ball valve: Suitable for general industrial applications with low corrosion requirements.
Fluorine lined ball valve: Mainly used in the treatment of highly corrosive media, such as chemical, petroleum, pharmaceutical and other fields.
Fluorine plastic lined ball valve has a smooth inner wall, straight flow channel, and small fluid resistance, almost close to zero. Therefore, it is particularly suitable for industrial pipelines with small fluid resistance. Because of its simple structure and easy operation, it has become the first choice in some strong acid, strong alkali and various corrosive medium pipelines.
Like general butterfly valves, fluoroplastic lined butterfly valves have a butterfly-shaped closing member (butterfly plate) that rotates around an axis perpendicular to the flow direction of the medium. There is a 0-90° limit block on the valve shaft to control the opening and closing of the butterfly valve. The valve body and butterfly plate are covered with a certain thickness of fluoroplastic. In order to facilitate assembly and molding, the valve body is often divided into two halves. Made into a clamp shape. And fasten the two halves of the valve body with countersunk screws.
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The butterfly plate and valve stem are integrated into a single unit, which is simple and strong and can withstand large opening and closing torques. The shaft seals at both ends can use F4 packing or coated plastic rubber rings. Fluorine plastic lined butterfly valves have developed rapidly, and the diameter DN has reached mm. The pressure also reaches 1.6Mpa.