Pneumatic butterfly valves are essential control units widely used in industrial pipelines. They use compressed air as the power source to quickly open or close the valve, often within seconds! These valves are simple in structure, easy to operate, and cost-effective. They can be used for quick shut-off applications and can also be paired with valve positioners to regulate pressure, flow, and temperature in pipelines.
Among the various types of pneumatic butterfly valves, fluorine-lined butterfly valves and metal seated butterfly valves are two commonly used variants. While they share the same control mechanism, their sealing structures and applications differ significantly. The fluorine-lined butterfly valve is ideal for corrosive media with moderate pressure and temperature, whereas the pneumatic metal seat butterfly valve can handle a wider range of pressures and temperatures but offers slightly lower sealing performance.
· Metal seated butterfly valves feature sealing surfaces made of metal or other hard materials on both sides.
· Fluorine-lined butterfly valves (soft-sealed) have at least one sealing surface made of soft materials, such as PTFE (polytetrafluoroethylene), which lines both the disc and seat.
· Fluorine-lined butterfly valves provide excellent sealing but are prone to aging and wear, leading to a shorter lifespan.
· Metal seal butterfly valves, especially high-quality metal sealing butterfly valves, are highly durable but may not achieve the same level of leak-tightness as soft-sealed valves.
· Fluorine-lined butterfly valves are suitable for常温常压 (normal temperature and pressure) environments with strong corrosion resistance.
· Pneumatic metal seat butterfly valves can withstand low, medium, and high temperatures, as well as higher pressures. They are ideal for abrasive media or temperatures exceeding 200°C.
The main difference in manufacturing lies in the valve seat material:
· Fluorine-lined valves use non-metallic (PTFE) seats.
· Metal seated butterfly valves require precise metal-to-metal sealing, considering hardness compatibility and media characteristics.
The selection between a fluorine-lined butterfly valve and a pneumatic metal seat butterfly valve depends on the process media, temperature, and pressure:
· For corrosive fluids at moderate conditions, choose a fluorine-lined butterfly valve.
· For high-pressure, high-temperature, or abrasive media, a high-quality metal sealing butterfly valve is the best option.
Whether you need corrosion resistance or extreme durability, understanding these differences ensures optimal valve performance in your application. For reliable solutions, always opt for metal seated butterfly valves when dealing with harsh industrial environments. If you need high-quality metal sealing butterfly valves, feel free to contact us for a quote!
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