The difference and selection of fluorine-lined butterfly valve and metal seated butterfly valve
As one of the most commonly used valves in process pipelines, butterfly valves are not only simple in structure, easy to operate, and equipped with different driving devices, but also can form a variety of control methods, such as electric butterfly valves, hydraulic butterfly valves, pneumatic butterfly valves, etc.! Moreover, butterfly valves are often used in occasions with large caliber and flow. Compared with other valves of the same caliber, the cost can be reduced by 1.5 to 2 times, which is economical and practical!
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According to the different sealing forms of butterfly valves, they can be divided into two categories, one is soft seal and the other is metal seated! The two butterfly valves with different sealing forms play different roles in the relatively used pipelines. In a sense, there are still big differences! When choosing, users should have a detailed understanding and awareness of the difference between the two!
Take the most common soft-sealed fluorine-lined butterfly valves and metal hard-sealed butterfly valves, fluorine-lined butterfly valves are generally used for pipelines containing corrosive media, and the sealing effect can reach zero leakage, but it is only suitable for normal temperature and pressure! The hard-sealed butterfly valve is relatively high in temperature and pressure, but the sealing and corrosion resistance are not as good as the soft-sealed butterfly valve!
1. From the structure: The metal seated butterfly valve refers to the metal material or other harder materials on both sides of the sealing pair. For soft sealing butterfly valves, the two contacting sealing surfaces can be separate or all of soft materials. For example, fluorine-lined butterfly valve means that the butterfly plate and valve seat are both wrapped in PTFE;
2. In terms of sealing performance: The advantage of the soft-sealed fluorine-lined butterfly valve is that it has good sealing performance, but the disadvantage is that it is easy to age, wear, and has a short service life. The metal seated butterfly valve has a long service life, but the sealing performance is relatively worse than that of the soft seal.
3. From the conditions of use: The soft-sealed fluorine-lined butterfly valve is used in normal temperature and pressure environments, while the hard-sealed butterfly valve can be used in low temperature, normal temperature, high temperature and other environments. Generally, it can be used for higher pressure, but the soft seal is not. However, the fluorine-lined butterfly valve has Super corrosion resistance!
4. From the manufacturing aspect: As for the manufacturing, from the principle point of view, the difference between the two is not big, mainly the difference in the valve seat. The soft-sealed fluorine-lined butterfly valve is a non-metallic structure, and the hard-sealed butterfly valve is a metal structure. It is necessary to consider the metal structure. The relationship between the hardness, the working conditions, what medium is used, and so on.
TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D
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There are various types of valves available in the butterfly valve range. The offset disc of Butterfly Valves comes with techniques like hand wheel operated, gear operated, electric operated, and pneumatic operated.
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The aim of using a butterfly valve is for isolating or regulating the flow of liquid. The closing technique takes the form similar to a disk. All the operation is similar to that of a ball valve, where a quick shut-off is there to regulate the flow. Usually, people prefer butterfly valves as they are inexpensive as compared to other valves due to their lightweight. A butterfly valve needs less support to function.
Here in butterfly valve sanitary, a circular pipe is attached which controls the flow of material through a circular pipe or tube. Usually, the materials for which a butterfly is used are air, gas, steam, or liquid. It can be also be used for certain dry materials.
Butterfly valves are quick opening valves associated with a metal circular disc along with its pivot axes at right angles. It regulates the direction of the flow of the pipe. It works with the mechanism that when it is rotated on a shaft, it seals against seats in the valve body. The butterfly valves are normally used as throttling valves to control flow. The high-performance butterfly valves do not have any pockets where the fluids may get trapped while the valve is closed.
This type of valve is one of the most compact, as well as lightweight valves, that exist on the earth. It has a wide range of applications. This kind of valve is more popular due to the choice of the seat as well as the lining. Moreover, the disc options have significantly enhanced the demand for the same over the latest years making the valve a smart alternative.
Being full of all the favorable qualities like the wide range of materials with desired sizes and pressure ratings offers reliable and positive isolation with moderate flow control potential more than a wide range of applications all the way through the valve industry.
The petrochemical trade and oil industry use this metal seated valve because they are fire safe, lightweight as well as perfectly suitable for actuation. If used for the appropriate application these butterfly valves offer you a great number of advantages. It is suitable for chemical services. The main advantage of the valve is that it can be used where space is less. It is designed to be used with small dimensions.
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